JP2019536373A - 1 Passive optical network system, optical line terminal, and optical network unit - Google Patents

Abstract

This application discloses PON systems, OLTs, and ONUs and relates to the field of optical communications. A PON system includes an OLT and at least two ONUs, and the OLT and at least two ONUs exchange data on one downstream channel and two upstream channels. The OLT sends downstream data to each ONU on a downstream channel, where the downstream data includes an upstream bandwidth grant, and the upstream bandwidth grant is used to control the ONU to transmit upstream data. , The ONU receives the downstream data on the downstream channel and transmits the upstream data on the first upstream channel or the second upstream channel based on the upstream bandwidth grant included in the downstream data. , The OLT receives the upstream data transmitted by each ONU on a first upstream channel and a second upstream channel, the registration function is disabled on the first upstream channel, and the second upstream In the channel Recording function is activated.

Description

  The present application relates to the field of optical communication, and more specifically, to a passive optical network (PON) system, an optical line terminal (OLT), and an optical network unit (ONU).

  Passive Optical Network (PON) is a point-to-multipoint network topology structure, which usually includes an optical line terminal (OLT) in the central office, and multiple optical network units ( Optical Distribution Unit (ODN) found OLT and ONU.

  In the PON system, the newly added ONU needs to complete registration and activation in the OLT before transmitting upstream service data to the OLT on the upstream channel. In an Ethernet Passive Optical Network (EPON) system, the OLT receives and registers a registration response packet sent by the ONU newly added on the upstream channel by creating a quiet zone. Assign a logical link identifier (Logical Link IDentifier, LLID) to the newly added ONU based on the media access control (MAC) address carried in the response packet, and measure the distance of the newly added ONU Complete. In a Gigabit-capable passive optical network (GPON), the OLT receives the registration response packet sent by the newly added ONU by creating a quiet zone, and the serial that was carried in the registration response packet. The ONU ID is assigned based on the number (Serial Number, SN), and the newly added ONU ranging is further completed.

  Once registered, registered ONUs are time-division multiplexed based on upstream transmission time slots assigned by the OLT to prevent upstream service data transmitted by another ONU from colliding with each other on the upstream channel. Upstream service data is transmitted to the OLT on the upstream channel by an access method (Time Division Multiple Access, TDMA). In addition, to avoid collision between the registration response packet and the upstream service data in the upstream channel when registering the newly added ONU, the OLT stops providing bandwidth permission for the registered ONU, ie, the registered ONU Stops sending upstream service data.

  In a PON system, registered ONUs need to send upstream service data only after the quiet zone is over. As a result, the upstream service data is transmitted with a relatively large delay, and the system delay requirement of the low delay service cannot be satisfied.

  Because the registered ONU needs to send upstream service data only after the quiet zone is over, the upstream service data is sent with a relatively large delay, and the system delay requirement of the low delay service cannot be satisfied To solve this problem, the embodiments of the present application provide a PON system, an OLT, and an ONU. The technical solutions are as follows.

According to a first aspect, a PON system is provided. The system includes an OLT and at least two ONUs, which are connected to each ONU using ODN, and the OLT and at least two ONUs exchange data on one downstream channel and two upstream channels,
OLT sends downstream data to each ONU on the downstream channel, which includes upstream bandwidth grant, which is used to control the ONU to send upstream data. ,
ONU receives the downstream data on the downstream channel, transmits the upstream data on the first upstream channel or the second upstream channel based on the upstream bandwidth grant included in the downstream data,
The OLT receives upstream data transmitted by each ONU on the first upstream channel and the second upstream channel,
The registration function is disabled in the first upstream channel, the registration function is enabled in the second upstream channel, and the registration function is used to register the unregistered ONU.

  Unlike the prior art in which data is exchanged by only one downstream channel and one upstream channel in the PON system, the present invention is the first in which the downstream channel and the registration function are disabled in the PON system. One upstream channel and a second upstream channel in which the registration function is enabled are configured. In order to prevent ONU registration from affecting upstream service data transmission and satisfy the system delay requirement of low-latency service, OLT sent downstream data to each ONU in the downstream channel in this way. Later, the ONU can send upstream service data and can perform ONU registration on another upstream channel based on the upstream bandwidth grant included in the downstream data.

  In one possible design, the downstream data includes a first upstream bandwidth grant and a second upstream bandwidth grant, where the first upstream bandwidth grant is upstream data on the first upstream channel. And the second upstream bandwidth grant is used to control the ONU to transmit upstream data on the second upstream channel.

In one possible design, the OLT generates a first upstream bandwidth grant and a second upstream bandwidth grant, and multiplexes the first upstream bandwidth grant and the second upstream bandwidth grant. To obtain a multiplexed upstream bandwidth grant,
The ONU obtains a first upstream bandwidth grant and a second upstream bandwidth by demultiplexing the received upstream bandwidth grant, and the first based on the first upstream bandwidth grant Transmit upstream data on the upstream channel and transmit upstream data on the second upstream channel based on the second upstream bandwidth grant.

  In this embodiment, the OLT generates a first upstream bandwidth grant and a second upstream bandwidth grant that are used to control the first upstream channel and the second upstream channel, respectively. Multiplexing the first upstream bandwidth grant and the second upstream bandwidth grant provides the upstream bandwidth grant multiplexed to each ONU in the downstream channel. In this way, the ONU can separately control data transmission on the first upstream channel and the second upstream channel based on the received upstream bandwidth grant, and the upstream data is transmitted from the first upstream channel and the first upstream channel. The OLT is reached sequentially through the two upstream channels, and collisions between upstream data are avoided.

In one possible design, the first upstream channel is used to send upstream service data, the second upstream channel is used to send registration response packets,
The OLT generates a first upstream bandwidth grant that includes an upstream transmission time slot, generates a second upstream bandwidth grant that includes a registration time slot, and
If the ONU is in the registered state, the ONU sends upstream service data to the OLT on the first upstream channel based on the upstream transmission time slot within the first upstream bandwidth grant, or
If the ONU is in an unregistered state, the ONU sends a registration response packet to the OLT on the second upstream channel based on the registration time slot within the second upstream bandwidth grant.

  Unlike the prior art in which the ONU sends upstream service data and upstream registration packets to the OLT on the same upstream channel, in this embodiment, if the ONU is in the registered state based on the ONU registration state, the ONU Sends upstream service data to the OLT on the first upstream channel for service communication with the OLT, and if the ONU is in an unregistered state, the ONU completes registration with the OLT, A registration response packet is transmitted to the OLT on the two upstream channels. Thus, when an unregistered ONU in the PON system is registered, the registered ONU can still send upstream service data to the OLT, and a delay caused by ONU registration in the PON system is avoided.

In one possible design, the first upstream channel is used to transmit the first upstream service data, and the second upstream channel transmits the registration response packet and the second upstream service data. Used for
The OLT generates a first upstream bandwidth grant that includes a first upstream transmission time slot, and generates a second upstream bandwidth grant that includes a second upstream transmission time slot and a registration time slot. ,
If the ONU is in the registered state, the ONU sends the first upstream service data to the OLT on the first upstream channel based on the first upstream transmission time slot within the first upstream bandwidth grant. Transmitting the second upstream service data to the OLT on the second upstream channel based on the second upstream transmission time slot within the second upstream bandwidth grant, or
If the ONU is in an unregistered state, the ONU sends a registration response packet to the OLT on the second upstream channel based on the registration time slot within the second upstream bandwidth grant.

  In this embodiment, the ONU transmits the upstream service data of the low-delay service on the first upstream channel, transmits the upstream service data of the high-delay service on the second upstream channel, performs ONU registration, By transmitting the service data on the two upstream channels, the transmission rate of the upstream service data is improved and the ONU registration is prevented from affecting the low-delay service.

  In one possible design, the OLT obtains the channel transmission quality of the first upstream channel and the second upstream channel, and the channel transmission quality of the first upstream channel is higher than the channel transmission quality of the second upstream channel. In a good case, the OLT controls to disable the registration function on the first upstream channel and controls to enable the registration function on the second upstream channel.

  In this embodiment, the OLT flexibly sets the registration function to be enabled and disabled on the upstream channel based on the channel transmission quality of the first upstream channel and the second upstream channel, and the low latency service is compared. Therefore, the data transmission quality of the PON system is further improved.

In one possible design, the OLT stores the generated upstream bandwidth grant,
OLT controls the reception of upstream data based on upstream bandwidth grant and / or performs authentication and analysis on the upstream data transmitted by each ONU based on upstream bandwidth grant To do.

  In this embodiment, since the OLT controls the reception of the upstream data using the generated upstream bandwidth grant, the upstream data is received more accurately. In addition, OLT authenticates upstream data received using upstream bandwidth permission, filters upstream data transmitted by unauthorized ONUs, and unauthorized access ONUs affect PON systems To further improve the security of the PON system.

In one possible design, ONU determines the service class for each service based on service delay requirements,
When the service class indicates that the service belongs to the first class, the ONU transmits upstream data corresponding to the service on the first upstream channel, or that the service belongs to the second class. When the service class indicates, the ONU transmits upstream data corresponding to the service on the second upstream channel,
The delay request for services belonging to the first class is higher than the delay request for services belonging to the second class.

  In this embodiment, the ONU classifies the service based on the service delay request, selects the first upstream channel in which the registration function is disabled to transmit the upstream data corresponding to the low delay service, Since the second upstream channel with the registration function enabled is selected to send upstream data corresponding to the high latency service, the low latency service is not affected by the ONU registration and the system of the low latency service The delay requirement is satisfied.

In one possible design, the BWmap message carries an upstream bandwidth grant if the system is a GPON system, or the Gate message carries an upstream bandwidth grant if the system is an EPON system.

  To implement upstream control for ONUs using upstream bandwidth grant and improve OLT applicability, for different types of PON systems, OLT grants upstream bandwidth for different types of messages. Add

In one possible design, if the BWmap message carries upstream bandwidth grant, a given bit in a given field in the BWmap message is used to identify the upstream channel corresponding to the BWmap message,
If the Gate message carries an upstream bandwidth grant, a new channel identifier field added to the Gate message is used to identify the upstream channel corresponding to the Gate message, or the operation code of the Gate message is included in the Gate message. Used to identify the corresponding upstream channel,
The predetermined field is a start time field or a GrantSize field, and the predetermined bit is one most significant bit or two most significant bits of the predetermined field.

  In one possible design, the downstream channel, the first upstream channel, and the second upstream channel share ODN with wavelength division multiplexing, and the wavelengths of the first upstream channel and the second upstream channel are Different.

  In this embodiment, in order to avoid interference between the upstream channel and the downstream channel and to ensure normal transmission of the upstream data and the downstream data, the upstream channel and the downstream channel in the PON system have different wavelengths. Used individually and share ODN with wavelength division multiplexing.

According to a second aspect, an OLT is provided, the OLT comprising at least one Dynamic Bandwidth Allocation (DBA) scheduling module, a downstream transmission convergence (TC) module, and an upstream TC. A module, a downstream transmitter, a first upstream burst receiver, and a second upstream burst receiver;
The DBA scheduling module is configured to generate upstream bandwidth grants, which are used to control each ONU to send upstream data,
The downstream TC module is connected to the DBA scheduling module and is configured to generate downstream data including upstream bandwidth grant through downstream framing and convergence,
The downstream transmitter is connected to the downstream TC module and is configured to transmit downstream data to each ONU in the downstream channel,
The upstream TC module is connected to the first upstream burst receiver and receives upstream data transmitted by each ONU on the first upstream channel using the first upstream burst receiver. Configured as
The upstream TC module is further connected to a second upstream burst receiver and receives upstream data transmitted by each ONU on the second upstream channel using the second upstream burst receiver. Configured to
The registration function is disabled in the first upstream channel, the registration function is enabled in the second upstream channel, and the registration function is used to register the unregistered ONU.

  Unlike the prior art in which OLT receives upstream service data on one upstream channel and performs ONU registration, this embodiment prevents ONU registration from affecting the transmission of upstream data for low-latency services. In order to guarantee normal ONU registration and satisfy the system delay requirement of low-latency service, the OLT has the first upstream channel with the registration function disabled and the second with the registration function enabled Receive upstream service data on the upstream channel and perform ONU registration.

  In one possible design, the downstream data includes a first upstream bandwidth grant and a second upstream bandwidth grant, where the first upstream bandwidth grant is upstream data on the first upstream channel. And the second upstream bandwidth grant is used to control the ONU to transmit upstream data on the second upstream channel.

In one possible design, the OLT includes a first DBA scheduling module, a second DBA scheduling module, and a multiplexing module;
The first DBA scheduling module is configured to generate a first upstream bandwidth grant;
The second DBA scheduling module is configured to generate a second upstream bandwidth grant;
The multiplexing module is connected to the first DBA scheduling module and the second DBA scheduling module and is configured to multiplex the first upstream bandwidth grant and the second upstream bandwidth grant. ,
The multiplexing module is further connected to the downstream TC module and is configured to provide the multiplexed upstream bandwidth grant to the downstream TC module.

  In this embodiment, the OLT uses the first DBA scheduling module to generate a first upstream bandwidth grant, uses the second DBA scheduling module to generate a second upstream bandwidth grant, and down In order to provide an upstream bandwidth grant multiplexed to each ONU in the stream channel, a multiplexing module is used to multiplex the first upstream bandwidth grant and the second upstream bandwidth grant. In order to allow upstream data to reach the OLT sequentially through the first upstream channel and the second upstream channel and to avoid collision of upstream data, the ONU thus grants received upstream bandwidth Based on the above, upstream data transmission in the first upstream channel and the second upstream channel can be controlled separately.

In one possible design, the first upstream channel is used to send upstream service data, the second upstream channel is used to send registration response packets,
The first DBA scheduling module is configured to generate a first upstream bandwidth grant that includes an upstream transmission time slot;
The second DBA scheduling module is configured to generate a second upstream bandwidth grant that includes a registration time slot;
The upstream transmission time slot is used to instruct registered ONUs to transmit upstream service data on the first upstream channel, and the registration time slot transmits a registration response packet on the second upstream channel. Used to command unregistered ONUs.

  In this embodiment, the OLT controls the first upstream channel used only for transmitting the upstream service data using the first DBA scheduling module, and the OLT is used only for transmitting the registration response packet. When the second upstream channel is controlled using the second DBA scheduling module and an unregistered ONU in the PON system is sending a registration response packet on the second upstream channel, the registered ONU is still Upstream service data can be transmitted on one upstream channel, and the situation where ONU registration affects the transmission of upstream service data is prevented.

In one possible design, the first upstream channel is used to transmit the first upstream service data, and the second upstream channel transmits the registration response packet and the second upstream service data. Used for
The first DBA scheduling module is configured to generate a first upstream bandwidth grant that includes a first upstream transmission time slot;
The second DBA scheduling module is configured to generate a second upstream bandwidth grant including a second upstream transmission timeslot and a registration timeslot;
The first upstream transmission time slot is used to instruct the registered ONU to transmit the first upstream service data on the first upstream channel, and the second upstream transmission time slot is the second Used to instruct the registered ONU to send the second upstream service data on the upstream channel of the non-registered ONU to send a registration response packet on the second upstream channel. The first upstream service data delay request is higher than the second upstream service data delay request.

  In this embodiment, the OLT uses the first DBA scheduling module to control the first upstream channel that is used only for transmitting the upstream service data corresponding to the low-delay service, and the registration response packet and the high-delay The second upstream channel used to transmit the upstream service data corresponding to the service is controlled using the second DBA scheduling module, so upstream service data is transmitted on the two upstream channels As a result, the transmission rate of the upstream service data is improved, and the situation where ONU registration affects the low-latency service is prevented.

In one possible design, the OLT further includes a control module that is connected to the first DBA scheduling module and the second DBA scheduling module;
The control module is configured to control the first DBA scheduling module to disable the registration function, and to control the second DBA scheduling module to enable the registration function,
The second upstream bandwidth grant generated by the second DBA scheduling module that activates the registration function includes a registration time slot, and the registration time slot transmits a registration response packet on the second upstream channel. Used to command unregistered ONUs.

  In this embodiment, a control module is arranged in the OLT, and the control module enables and disables the registration function in order to flexibly set the first upstream channel and the second upstream channel. It is configured to control the first DBA scheduling module and the second DBA scheduling module.

In one possible design, the OLT includes a DBA scheduling module and a control module connected to the DBA scheduling module,
The control module is configured to control the DBA scheduling module to enable or disable the registration function,
When disabling the registration function, the DBA scheduling module generates a first upstream bandwidth grant that includes the first upstream transmission time slot, or the first upstream that includes the first upstream transmission time slot. Configured to generate a stream bandwidth grant and a second upstream bandwidth grant including a second upstream transmission time slot;
When enabling the registration function, the DBA scheduling module generates a first upstream bandwidth grant that includes a first upstream transmission time slot and a second upstream bandwidth grant that includes a registration time slot. Further configured
The first upstream transmission time slot is used to instruct the registered ONU to transmit upstream service data on the first upstream channel, and the second upstream transmission time slot is the second upstream Used to instruct registered ONUs to send upstream service data on the channel, and the registered timeslot is used to instruct unregistered ONUs to send registration response packets on the second upstream channel. Is called.

  In this embodiment, the OLT uses the control module to control the DBA scheduling module to enable or disable the registration function, and the DBA scheduling module responds based on the enabled state and the disabled state of the registration function. A second upstream bandwidth grant corresponding to the first upstream bandwidth grant is generated, and the first upstream channel and the second upstream channel are sequentially managed.

In one possible design, the OLT further includes memory,
A memory is connected to each DBA scheduling module and is configured to store upstream bandwidth grants generated by each DBA scheduling module;
The upstream TC module is connected to the memory and controls the first upstream burst receiver and the second upstream burst receiver to receive upstream data based on the upstream bandwidth grant. And / or based on upstream bandwidth grants, configured to perform authentication and analysis on upstream data transmitted by each ONU.

  In this embodiment, the upstream TC module uses the generated upstream bandwidth grant to control each upstream burst receiver to receive the upstream data, so the upstream data is received more accurately. Is done. In addition, the upstream TC module authenticates the upstream data received using the upstream bandwidth permission, filters the upstream data transmitted by unauthorized ONUs, and the ONU that performs unauthorized access PON Preventing the system from being affected and further improving the security of the PON system.

In one possible design, if OLT is used in a GPON system, BWmap messages carry upstream bandwidth grants, or
When OLT is used in an EPON system, a Gate message carries upstream bandwidth grant.

In one possible design, if the BWmap message carries upstream bandwidth grant, a given bit in a given field in the BWmap message is used to identify the upstream channel corresponding to the BWmap message,
If the Gate message carries an upstream bandwidth grant, a new channel identifier field added to the Gate message is used to identify the upstream channel corresponding to the Gate message, or the operation code of the Gate message is included in the Gate message. Used to identify the corresponding upstream channel, the predetermined field is a start time field or a GrantSize field, and the predetermined bit is one most significant bit or two most significant bits of the predetermined field.

  In one possible design, the downstream channel, the first upstream channel, and the second upstream channel share one optical distribution network ODN in wavelength division multiplexing, and the first upstream channel and the second upstream channel. Stream channel wavelengths are different.

According to a third aspect, ONU is provided. The ONU includes a downstream TC module, at least one DBA response module, an upstream TC module, a downstream receiver, a first upstream burst transmitter, and a second upstream burst transmitter,
The downstream TC module is connected to the downstream receiver and the DBA response module, and is configured to provide downstream data received by the downstream receiver on the downstream channel to the DBA response module. Is sent by OLT,
The DBA response module is connected to the upstream TC module and is configured to control the upstream TC module to transmit the upstream data based on the upstream bandwidth grant included in the downstream data,
The upstream TC module is connected to the first upstream burst transmitter and is configured to transmit upstream data on the first upstream channel using the first upstream burst transmitter,
The upstream TC module is connected to the second upstream burst transmitter and is configured to transmit upstream data on the second upstream channel using the second upstream burst transmitter,
The registration function is disabled in the first upstream channel, the registration function is enabled in the second upstream channel, and the registration function is used to register the unregistered ONU.

  Unlike the prior art in which ONU transmits upstream service data on one upstream channel and performs ONU registration, this embodiment prevents ONU registration from affecting the transmission of upstream service data and has low latency. To satisfy the system delay requirement for service, the ONU sends upstream service data on the first upstream channel with the registration function disabled and the second upstream channel with the registration function enabled. , ONU registration.

  In one possible design, the downstream data includes a first upstream bandwidth grant and a second upstream bandwidth grant, where the first upstream bandwidth grant is upstream data on the first upstream channel. And the second upstream bandwidth grant is used to control the ONU to transmit upstream data on the second upstream channel.

In one possible design, the ONU includes a first DBA response module, a second DBA response module, and a demultiplexing module,
The demultiplexing module is connected to the downstream TC module and receives the upstream bandwidth grant received by the downstream TC module to obtain a first upstream bandwidth grant and a second upstream bandwidth grant. Is configured to demultiplex
The first DBA response module is connected to the demultiplexing module and controls the upstream TC module to transmit upstream data on the first upstream channel based on the first upstream bandwidth grant. Configured as
The second DBA response module is connected to the demultiplexing module and controls the upstream TC module to transmit upstream data on the second upstream channel based on the second upstream bandwidth grant. Configured as follows.

  In this embodiment, in order to allow upstream data to reach the OLT sequentially and to avoid collision of the upstream data, the ONU receives the downstream data and then uses the demultiplexing module to receive the data in the downstream data. By demultiplexing the upstream bandwidth grant, the first upstream bandwidth grant and the second upstream bandwidth grant are obtained, and the first upstream bandwidth grant and the second upstream bandwidth grant are obtained. The upstream data is transmitted separately based on the above.

In one possible design, the first upstream channel is used to send upstream service data, the second upstream channel is used to send registration response packets,
If the ONU is in the registered state, the upstream TC module transmits a first enable signal to the first upstream burst transmitter based on the upstream transmission time slot within the first upstream bandwidth grant The first enabling signal is used to instruct the first upstream burst transmitter to transmit upstream service data on the first upstream channel;
If the ONU is in an unregistered state, the upstream TC module will send a second enable signal to the second upstream burst transmitter based on the registered time slot within the second upstream bandwidth grant. Configured, and the second enable signal is used to instruct the second upstream burst transmitter to transmit a registration response packet on the second upstream channel.

  In this embodiment, in order to prevent registration data packets from affecting the transmission of upstream service data, the first upstream channel is configured to be used only for transmitting upstream service data, and the second The upstream channel is configured to be used only for sending registration response packets, so when an unregistered ONU in the PON system is sending registration response packets on the second upstream channel, Registered ONUs can transmit upstream service data on the first upstream channel.

In one possible design, the ONU includes an optical module slot, which is used to plug in the first optical module or the second optical module,
The first optical module includes at least a downstream receiver and a first upstream burst transmitter;
The second optical module includes at least a downstream receiver and a second upstream burst transmitter;
When the ONU is in an unregistered state, the second optical module is inserted into the optical module slot, or when the ONU is in a registered state, the first optical module is inserted into the optical module slot.

  In this embodiment, the downstream receiver and the first upstream burst transmitter are integrated into the first optical module, and the downstream receiver and the second upstream burst transmitter are integrated into the second optical module. All of the newly added ONUs can complete the ONU registration using the same second optical module, improving the use of the second upstream burst transmitter, and the manufacturing cost of the ONU Decrease.

In one possible design, the first upstream channel is used to transmit the first upstream service data, and the second upstream channel transmits the registration response packet and the second upstream service data. The delay request for the first upstream service data is higher than the delay request for the second upstream service data,
If the ONU is in the registered state, the upstream TC module sends a third enable signal to the first upstream burst transmitter based on the first upstream transmission time slot within the first upstream bandwidth grant. The third enabling signal is used to instruct the first upstream burst transmitter to transmit the first upstream service data on the first upstream channel; And the upstream TC module is configured to transmit a fourth enable signal to the second upstream burst transmitter based on the second upstream transmission time slot within the second upstream bandwidth grant, The fourth enabling signal transmits the second upstream service data on the second upstream channel. And used to command the second upstream burst transmitter,
If the ONU is in an unregistered state, the upstream TC module will send a fifth enable signal to the second upstream burst transmitter based on the registered time slot within the second upstream bandwidth grant. Configured, and the fifth enable signal is used to instruct the second upstream burst transmitter to transmit a registration response packet on the second upstream channel.

  In this embodiment, upstream service data is transmitted using two upstream channels, the transmission rate of the upstream service data is improved in the PON system, and ONU registration does not affect the transmission of the first upstream service data. The first upstream channel is configured to be used only for transmitting the first upstream service data, and the second upstream channel is a registration response packet and the second upstream service data. And is configured to transmit.

In one possible design, ONU further includes a service classification module,
The service classification module is configured to collect a delay request for each service and determine a service class of the service based on the delay request;
The DBA response module is connected to the service classification module, and when the service class indicates that the service belongs to the first class, the first upstream service data corresponding to the service is transmitted to the first upstream channel. Configured to control the upstream TC module to transmit at
The DBA response module, when the service class indicates that the service belongs to the second class, the upstream TC module to transmit the second upstream service data corresponding to the service on the second upstream channel Is further configured to control.

  In this embodiment, in order to prevent the low latency service from being affected by ONU registration and satisfy the system delay requirement of the low latency service, ONU classifies the service using the service classification module, and the registration function is disabled. The first upstream channel that is selected to transmit upstream data corresponding to the low latency service, and the second upstream channel that has the registration function enabled is the upstream data corresponding to the high latency service Select to send.

In one possible design, the ONU includes a first optical module slot and a second optical module slot, where the first optical module slot is used to plug in the first optical module and the second optical module slot Is used to plug in the second optical module,
The first optical module includes at least a first upstream burst transmitter;
The second optical module includes at least a downstream receiver and a second upstream burst transmitter;
When the second upstream service data is transmitted, the second optical module is inserted into the second optical module slot, and when the first upstream service data and the second upstream service data are transmitted, The second optical module is inserted into the second optical module slot, and the first optical module is inserted into the first optical module slot.

In one possible design, ONU includes one DBA response module and a channel selection module,
The channel selection module is connected to the first upstream burst transmitter, the second upstream burst transmitter, and the upstream TC module,
The DBA response module controls the upstream TC module to send upstream service data based on the first upstream bandwidth grant, or sends a registration response packet based on the second upstream bandwidth grant Configured to control the upstream TC module, and so on
The channel selection module selects the first upstream burst transmitter to transmit the upstream service data generated by the upstream TC module when the ONU is in a registered state, or the ONU is in an unregistered state In some cases, the second upstream burst transmitter is configured to transmit a registration response packet generated by the upstream TC module.

  In this embodiment, in order to dynamically perform ONU energy saving, the ONU channel selection module transmits upstream service data on the first upstream channel based on the ONU registration state, or the second The registration response packet is transmitted on the upstream channel.

In one possible design, if ONU is used in a GPON system, a BWmap message carries upstream bandwidth grants, or
When ONU is used in an EPON system, a Gate message carries upstream bandwidth grant.

In one possible design, if the BWmap message carries upstream bandwidth grant, a given bit in a given field in the BWmap message is used to identify the upstream channel corresponding to the BWmap message,
If the Gate message carries an upstream bandwidth grant, a new channel identifier field added to the Gate message is used to identify the upstream channel corresponding to the Gate message, or the operation code of the Gate message is included in the Gate message. Used to identify the corresponding upstream channel,
The predetermined field is a start time field or a GrantSize field, and the predetermined bit is one most significant bit or two most significant bits of the predetermined field.

  In one possible design, the downstream channel, the first upstream channel, and the second upstream channel share one ODN in wavelength division multiplexing, and the first upstream channel and the second upstream channel The wavelength is different.

1 is a structural system diagram of a PON system according to an embodiment of the present application. FIG. 1 is a schematic structural diagram of an OLT according to a first embodiment of the present application. FIG. 5 is a schematic structural diagram of an OLT according to a second embodiment of the present application. FIG. 6 is a schematic structural diagram of an OLT according to a third embodiment of the present application. 1 is a schematic structural diagram of an ONU according to a first embodiment of the present application. FIG. 5 is a schematic structural diagram of an ONU according to a second embodiment of the present application. FIG. 6 is a schematic structural diagram of an ONU according to a third embodiment of the present application. FIG. 6 is a schematic structural diagram of an ONU according to a fourth embodiment of the present application. FIG. 10 is a schematic structural diagram of an ONU according to a fifth embodiment of the present application. FIG. 10 is a schematic structural diagram of an ONU according to a sixth embodiment of the present application. 2 is a flowchart of a data exchange process in a PON system according to an embodiment of the present application. 4 is a flowchart of a data exchange process in a PON system according to another embodiment of the present application.

  To make the purpose and technical solutions and advantages of the present application clearer, the implementation of the present application will be described in more detail with reference to the accompanying drawings.

  In this specification, “a plurality of” means two or more. The term “and / or (and / or)” describes a related relationship of related objects, meaning that there can be three relationships. For example, A and / or B (A and / or B) may mean three cases: a case where only A exists, a case where both A and B exist, and a case where only B exists. The character “/” usually means an “or” relationship of related objects.

  In the prior art, the PON system includes only one downstream channel and one upstream channel. The OLT transmits downstream data to the registered ONUs in a time division multiplexing manner on the downstream channel. Correspondingly, each registered ONU transmits upstream service data to the OLT on the upstream channel in the upstream transmission time slot of the ONU in a time division multiple access scheme to avoid collision of upstream service data. However, each newly added ONU in the PON system must be registered in the OLT on the upstream channel when registering the newly added ONU (usually 200 μs to 250 μs). The ONU stops sending upstream service data on the upstream channel to prevent the registration response packet sent by the newly added ONU from colliding with the upstream service data sent by the registered ONU. There is a need. The collision between the upstream service data and the registration response packet can be effectively avoided by using the above-described collision prevention mechanism, but the delay of the upstream service data is increased. As a result, existing PON systems can be high-definition video (4K or 8K video) services, augmented reality (AR) services, virtual reality (VR) services, or mobile fronthaul (Mobile Fronthaul). ) Cannot meet the delay requirements of low-delay services.

  In the embodiment of the present application, the PON system includes one downstream channel and two upstream channels, where the registration function is enabled on one of the two upstream channels and the registration function is disabled on the other. In a PON system, an unregistered ONU can perform registration and activation on an upstream channel with the registration function enabled, and a registered ONU can transmit upstream service data on the upstream channel with the registration function disabled. . In other words, in order to prevent ONU registration and activation from affecting the transmission of upstream service data, the OLT can simultaneously receive a registration response packet and upstream service data transmitted by the ONU.

  FIG. 1 is a structural system diagram of a PON system according to an embodiment of the present application. The PON system includes an OLT 110 and at least one ONU 120, which is connected to each ONU 120 using ODN 130.

  The OLT 110 is a central office device in the PON system and has functions such as ONU registration, bandwidth allocation, and downstream data transmission.

  In the present embodiment of the present application, the OLT 110 includes a downstream transmitter, a first upstream burst receiver, and a second upstream burst receiver. OLT 110 uses a downstream transmitter (downstream channel of ODN 130) to transmit downstream data to ONU 120, and upstream data bursted by ONU 120 is transmitted to the first upstream burst receiver and the second. Using an upstream burst receiver.

  ODN 130 is used to provide an optical transmission channel between OLT 110 and each ONU 120. Specifically, ODN 130 includes an optical fiber 131 and a power splitter 132.

In this embodiment of the present application, the PON system includes a downstream channel, a first upstream channel, and a second upstream channel, and the downstream channel, the first upstream channel, and the second upstream channel are ODN. It is used as a logical channel in 130 and shares ODN 130 with wavelength division multiplexing. In addition, to prevent the channel will affect each other, the wavelength of the downstream channels is lambda _1, the wavelength of the first upstream channel is lambda _2, the wavelength of the second upstream channel in lambda ₃ Yes, λ ₂ ≠ λ ₃ .

  The ONU 120 is a user side device in the PON system, and has functions such as a registration response, a bandwidth allocation request, and downstream data reception.

  In this embodiment of the present application, each ONU 120 is provided with a downstream receiver, a first upstream burst transmitter, and a second upstream burst transmitter. ONU 120 receives downstream data transmitted by OLT 110 on the downstream channel using the downstream receiver, and bursts upstream data on the first upstream channel using the first upstream burst transmitter. Transmit and burst transmit upstream data on a second upstream channel using a second upstream burst transmitter.

  The PON system shown in FIG. 1 may be an EPON system or a GPON system. This is not limited in the present embodiment of the present application.

  FIG. 2 is a schematic structural diagram of an OLT according to an embodiment of the present application. In the present embodiment, an example in which OLT is used in the PON system shown in FIG. 1 is used for explanation. The OLT includes at least one DBA scheduling module 210, a downstream TC module 220, an upstream TC module 230, a downstream transmitter 240, a first upstream burst receiver 241, and a second upstream burst. A receiver 242.

  The DBA scheduling module 210 has a scheduling control function, generates upstream bandwidth grants, and also sets each ONU to upstream bandwidth to transmit upstream data on the first upstream channel and the second upstream channel. Configured to control with permissions. Specifically, the first upstream bandwidth grant generated by the DBA scheduling module 210 is used to control the ONU to transmit upstream data on the first upstream channel, and the DBA scheduling module 210 The second upstream bandwidth grant generated by is used to control the ONU to transmit upstream data on the second upstream channel.

  Note that in different PON systems, the messages used to carry the upstream bandwidth grant generated by the DBA scheduling module 210 are also different. Optionally, a BWmap message is used to carry upstream bandwidth grants when OLT is used in GPON systems, or an upstream bandwidth grant when OLT is used in EPON systems. A Gate message is used. In this embodiment of the present application, the specific type of message carrying the upstream bandwidth grant is not limited.

  The downstream TC module 220 is connected to the respective DBA scheduling module 210 and obtains the upstream bandwidth grant generated by the respective DBA scheduling module 210, and also includes the upstream bandwidth grant through downstream framing and convergence It is configured to generate downstream data. Downstream data further includes downstream service data that the ONU requests to obtain, such as video data and audio data that the ONU requests to obtain.

  Optionally, after completing the upper layer service adaptation, GPON encapsulation mode (G-PON Encapsulation Mode, GEM) encapsulation, TC framing, and physical layer adaptation, the downstream TC module 220 is downstream. Generate data. The upper layer service adaptation includes user data adaptation, optical network unit management / control interface (ONU Management and Control Interface, OMCI) adaptation, and the like.

  Optionally, the upstream bandwidth grants corresponding to the first upstream channel and the second upstream channel are both transmitted to the ONU on the same downstream channel. Correspondingly, the ONU transmits upstream data on the corresponding upstream channel based on the identified upstream bandwidth grant, so that after receiving the upstream bandwidth grant, the ONU responds with the upstream bandwidth grant. It is necessary to further determine the stream channel. Thus, the upstream bandwidth grant includes an upstream channel identifier, and the ONU can identify the received upstream bandwidth grant based on the upstream channel identifier.

  The downstream transmitter 240 is connected to the downstream TC module 220 and is configured to transmit the downstream data generated by the downstream TC module 220 to each ONU on the downstream channel.

  The downstream transmitter 240 transmits downstream data to each ONU in the PON system in a broadcast manner, and the downstream data is transmitted in the form of an optical carrier signal in the downstream channel.

  The OLT can use the DBA scheduling module 210, the downstream TC module 220, and the downstream transmitter 240 to complete the transmission of downstream data. The ONU that receives the downstream data transmits the upstream data on the first upstream channel or the second upstream channel based on the upstream bandwidth permission included in the downstream data.

In one possible design, ONU sending upstream data on the upstream channel includes the following cases.
1: If the ONU is not registered, a registration response packet is transmitted on the second upstream channel.
2: If ONU has been registered, upstream service data on the first upstream channel (both low service upstream service data and high delay service upstream service data are both transmitted on the first upstream channel) Send).
3: If the ONU is registered and the system does not include the unregistered ONU, the low-latency service upstream service data is transmitted on the first upstream channel, and the high-latency service is upgraded on the second upstream channel. Send stream service data.
4: If the ONU is registered and the system includes an unregistered ONU, only the upstream service data of the low-delay service is transmitted on the first upstream channel.

  As shown in FIG. 2, the OLT upstream TC module 230 is connected to the first upstream burst receiver 251 and the second upstream burst receiver 252, and the first upstream burst Receiver 251 is used to receive upstream data transmitted by ONU on the first upstream channel, and second upstream burst receiver 252 is upstream transmitted by ONU on the second upstream channel. Used to receive stream data. Upstream data is transmitted in the form of an optical carrier signal in the first upstream channel and the second upstream channel.

  In this embodiment of the present application, the registration function is disabled in the first upstream channel, the registration function is enabled in the second upstream channel, and registration in the first upstream channel and the second upstream channel is performed. The enabling and disabling of functions is controlled by the DBA scheduling module 210.

  When the registration function is disabled on the first upstream channel and the registration function is enabled on the second upstream channel, unregistered ONUs in the PON system send registration response packets only on the second upstream channel. Send. Correspondingly, the OLT can receive the registration response packet only on the second upstream channel using the second upstream burst receiver 262, and can register the unregistered ONU based on the registration response packet.

  Needless to say, an unregistered ONU in the PON system sends a registration response packet to the OLT on the second upstream channel, but a registered ONU in the system sends the upstream service data to the OLT on the first upstream channel. The upstream service data and the registration response packet do not collide with each other in different upstream channels.

  The ONU can send upstream service data corresponding to a low-latency service (a service with a relatively high delay request) on the first upstream channel, and a registration response packet and / or a high-delay service on the second upstream channel ( It is easy to understand that the upstream service data corresponding to a service with a relatively low delay requirement can be transmitted, and that the system reliably satisfies the delay requirement of the low latency service while ensuring the normal registration of unregistered ONUs. .

  Note that the downstream channel, the first upstream channel, and the second upstream channel share one ODN in the wavelength division multiplexing method, and the wavelengths of the first upstream channel and the second upstream channel are different. The OLT further includes a wavelength multiplexer / demultiplexer 260 configured to combine or split optical carrier signals in the upstream and downstream channels.

  In one possible implementation, the OLT has two DBA scheduling modules, which use the two DBA scheduling modules to transmit upstream data separately on the first upstream channel and the second upstream channel. Control. Based on the OLT shown in FIG. 2, the OLT includes a first DBA scheduling module 211, a second DBA scheduling module 212, and a multiplexing module 270, as shown in FIG.

  The first DBA scheduling module 211 is configured to generate a first upstream bandwidth grant, the first upstream bandwidth grant is used to control transmission of upstream data in the first upstream channel used. The second DBA scheduling module 212 is configured to generate a second upstream bandwidth grant, the second upstream bandwidth grant is used to control transmission of upstream data in the second upstream channel used.

  Optionally, the first DBA scheduling module 211 is connected to the second DBA scheduling module 212 to achieve load balancing of the first upstream channel and the second upstream channel. Once the upstream bandwidth grant is generated, the first DBA scheduling module 211 and the second DBA scheduling module 212 exchange information over this connection to achieve upstream bandwidth scheduling optimization. This is not limited in the present embodiment of the present application.

  The multiplexing module 270 is connected to the first DBA scheduling module 211 and the second scheduling module 212 and obtains the first upstream bandwidth grant and the second upstream bandwidth grant, and the upstream bandwidth It is configured to multiplex the width grants, and ultimately generates a multiplexed upstream bandwidth grant.

  Since the first upstream bandwidth grant and the second upstream bandwidth grant are multiplexed and sent to the ONU on the same downstream channel, the first upstream bandwidth grant and the second upstream bandwidth After obtaining the width grant, the multiplexing module 270 needs to add an upstream channel identifier corresponding to the upstream bandwidth grant, and then multiplexes the upstream bandwidth grant with the added upstream channel identifier. Thus, the ONU can distinguish between the first upstream bandwidth grant and the second upstream bandwidth grant, and can determine the upstream channel corresponding to the different upstream bandwidth grants. Optionally, the upstream channel identifier may be generated by a DBA scheduling module, ie the DBA scheduling module directly generates an upstream bandwidth grant with the upstream channel identifier. This is not limited in the present embodiment of the present application.

  In one possible implementation, if OLT is used in a GPON system, the multiplexing module 270 will generate a first BWmap message (generated by the first DBA scheduling module) and a second BWmap message (second DBA scheduling module). Separately) to the upstream channel identifier.

  Specifically, the start time field and GrantSize field of the BWmap message are both 16 bits, but since the actual value range is 0 to 9719, that is, only 14 bits are used, the multiplexing module 270 The upstream channel corresponding to the BWmap message can be specified using one most significant bit or two most significant bits of the field and GrantSize field. For example, if one most significant bit is 0, this means that the BWmap message corresponds to the first upstream channel, and if one most significant bit is 1, this means that the BWmap message This means that it corresponds to the second upstream channel. Alternatively, if the two most significant bits are 00, this means that the BWmap message corresponds to the first upstream channel, and if the two most significant bits are 11, this means that the BWmap message This means that it corresponds to the second upstream channel.

  In another possible implementation, when OLT is used in an EPON system, the multiplexing module (or DBA scheduling module) uses a channel identifier field in the Gate message to indicate the upstream channel corresponding to the Gate message. Add a new one. For example, if the channel message field CH_Num is newly added to the Gate message and CH_Num is 0x00, this means that the Gate message corresponds to the first upstream channel, and if CH_Num is 0x01, This means that the Gate message corresponds to the second upstream channel.

  As an option, when the OLT is used in an EPON system, the upstream channel corresponding to the Gate message may be specified using various operation codes (Opcode). For example, if the operation code of the Gate message is 0xaa, this means that the Gate message corresponds to the first upstream channel, and if the operation code of the Gate message is 0xbb, this means that the Gate message is the second It corresponds to the upstream channel.

  After the upstream channel identifier is added to the first upstream bandwidth grant and the second upstream bandwidth grant, the multiplexing module 270 performs the first upstream bandwidth grant and the second upstream bandwidth grant. Is multiplexed and multiplexed to obtain a multiplexed upstream bandwidth grant.

  Multiplexing module 270 is further connected to downstream TC module 220 and is configured to provide upstream bandwidth grants multiplexed to downstream TC module 220. Downstream TC module 220 uses downstream transmitter 240 to transmit downstream data including upstream bandwidth grant on the downstream channel.

  Optionally, multiplexing module 270 is further connected to upstream TC module 230 and is configured to provide multiplexed upstream bandwidth grants to upstream TC module 230. Correspondingly, the upstream TC module 230 controls the first upstream burst receiver 251 to receive upstream data transmitted by the ONU on the first upstream channel based on the upstream bandwidth grant. The second upstream burst receiver 252 is controlled to receive upstream data transmitted by the ONU on the second upstream channel.

  Upstream data is transmitted in bursts on the first upstream channel and the second upstream channel. Thus, as an option, the OLT further includes a memory 280, as shown in FIG. 3, the OLT knows the arrival time of the upstream data, and the upstream burst receiver of the OLT receives the upstream data. Prepare to receive data before it arrives. The memory 280 is connected to each DBA scheduling module, and the memory 280 is further connected to the multiplexing module 270 and the upstream TC module 230.

  After obtaining the upstream bandwidth grant generated by each DBA scheduling module, the memory 280 makes two copies of the upstream bandwidth grant. One copy is sent to the multiplexing module 270. Multiplex module 270 multiplexes the upstream bandwidth grant and then transmits the multiplexed upstream bandwidth grant to downstream TC module 220. The downstream TC module 220 generates downstream data including upstream bandwidth grant through downstream framing and convergence, and finally transmits the downstream data to the ONU. The other copy is stored and sent to the upstream TC module 230. The upstream TC module 230 controls the first upstream burst receiver 251 to receive the upstream data burst transmitted by the ONU on the first upstream channel based on the upstream bandwidth grant, The second upstream burst receiver 252 is controlled to receive upstream data burst transmitted by the ONU on the two upstream channels.

  Optionally, after obtaining upstream bandwidth grant and before the upstream data arrives, the upstream TC module 230 may include a first upstream burst receiver 251 and a second upstream burst transmitter 252. To the first upstream burst receiver 251 to start receiving upstream data transmitted by the ONU on the first upstream channel and ONU on the second upstream channel. Instructs the second upstream burst receiver 252 to start receiving the transmitted upstream data.

  Further, the upstream TC module 230 further transmits an ONU that transmits upstream data on the first upstream channel and an ONU that transmits upstream data on the second upstream channel to further transfer the upstream data. Can be identified based on upstream bandwidth grant.

  Further, the upstream TC module 230 further performs authentication on the upstream data transmitted by the ONU based on the upstream bandwidth permission in order to determine whether the ONU performing unauthorized access is in the PON system. it can. For example, when detecting upstream data out of the upstream transmission time slot indicated by permission of upstream bandwidth, the upstream TC module 230 determines that the ONU that performs unauthorized access exists in the PON system. As another example, after receiving the upstream data, the upstream TC module 230 determines the upstream bandwidth based on the upstream transmission time slot in which the transmitting side (ONU transmitting upstream data) transmits the upstream data. The corresponding ONU identifier is searched for permission, and if the found ONU identifier does not match the ONU identifier on the transmitting side, it is determined that there is an ONU that performs unauthorized access in the PON system. The ONU identifier is an LLID or ONU ID assigned by OLT. For authenticated upstream data, the OLT directly filters the upstream data, and for authenticated upstream data, the OLT further analyzes the upstream data and includes it in the upstream data. Get service information.

  In another possible implementation, the multiplexing module 270 may be further connected to a first DBA scheduling module 211 and a second DBA scheduling module 212 and multiplexed into a memory 280 connected to the multiplexing module 270. Upstream bandwidth grants may be provided. The memory 280 separately provides upstream bandwidth grants multiplexed to the upstream TC module 230 and the downstream TC module 220 connected to the memory 280. The connection order of the multiplexing module and the memory is not limited in the present embodiment of the present application.

  In this embodiment, because the memory is used to provide upstream bandwidth grant to the upstream TC module, the upstream TC module is based on the upstream bandwidth grant to receive the upstream burst receiver that receives the upstream data. Can be controlled. Thus, the upstream data is received more accurately. In addition, the upstream TC module can further perform authentication on the received upstream data using upstream bandwidth permission to prevent unauthorized access to the ONU from affecting the PON system.

  In the OLT shown in FIG. 3, when the first DBA scheduling module 211 is configured to disable the registration function, and the second DBA scheduling module 212 is configured to enable the registration function, The newly added ONU can be registered only by the second upstream channel corresponding to the second DBA scheduling module 212. To flexibly set the registration function, the OLT further includes a control module 290, as shown in FIG.

  The control module 290 is connected to the first DBA scheduling module 211 and the second DBA scheduling module 212, and enables the registration function to control the enabling and disabling of the registration function in the corresponding upstream channel. It is configured to control either one of the first DBA scheduling module 211 and the second DBA scheduling module 212.

  As an option, the control module 290 sets validation and invalidation of the registration function by the first DBA scheduling module 211 and the second DBA scheduling module 212 according to the received setting command. Setting commands are entered by an external device connected to the OLT.

  Optionally, the control module 290 obtains the channel transmission quality of the first upstream channel and the second upstream channel at a predetermined interval, and the channel transmission quality of the first upstream channel is the second upstream channel. If the channel transmission quality is better than the channel, the first DBA scheduling module 211 is controlled to disable the registration function, and the second DBA scheduling module 212 is controlled to enable the registration function. If the channel transmission quality of the upstream channel is better than the channel transmission quality of the first upstream channel, the first DBA scheduling module 211 is controlled to enable the registration function and the registration function is disabled. 2 DBA scheduling module 212 is controlled. In this embodiment of the present application, the control module 290 controls the first DBA scheduling module 211 so as to invalidate the registration function, and also controls the second DBA scheduling module 212 so as to validate the registration function. Is used for illustration, but is not intended to limit the present application.

  The first upstream bandwidth grant generated by the first DBA scheduling module that disables the registration function includes an upstream transmission time slot, and the registered ONU in the PON system is based on the upstream transmission time slot. Transmit upstream service data on one upstream channel. The second upstream bandwidth grant generated by the second DBA scheduling module that activates the registration function includes a registration time slot, and the unregistered ONU in the PON system uses the second upstream based on the registration time stamp. Send a registration response packet on the channel. Finally, the OLT completes registration and activation of the unregistered ONU based on the registration response packet.

  Optionally, in the OLT shown in FIG. 3, the first upstream channel is configured to transmit only upstream service data and the second upstream channel is configured to transmit only registration response packets. Is done. Specifically, any upstream service data in the PON system is transmitted on the first upstream channel, and any registration response packets in the system are transmitted on the second upstream channel.

  The first DBA scheduling module 211 is configured to generate a first upstream bandwidth grant that includes an upstream transmission time slot.

  The upstream transmission time slot is used to instruct registered ONUs in the PON system to transmit upstream service data on the first upstream channel, and the upstream transmission time slots corresponding to different ONUs are different. Refer to the GPON series standard and / or the EPON series standard for the method of specifying the upstream transmission time slot. This is not limited in the present embodiment of the present application.

  Optionally, the first upstream bandwidth grant includes a correspondence between the ONU identifier and the upstream transmission time slot. The ONU searches for the corresponding upstream transmission time slot based on the ONU identifier of the ONU, and transmits the upstream service data in bursts at the time indicated by the upstream transmission time slot.

  The second DBA scheduling module 212 is configured to generate a second upstream bandwidth grant that includes a registration time slot.

  The registration time slot is used to instruct the unregistered ONU in the PON system to send a registration response packet on the second upstream channel. When the unregistered ONU receives a second upstream bandwidth grant on the downstream channel and detects that the second upstream bandwidth grant includes a registered time slot, the time indicated by that registered time slot A registration response packet is transmitted to.

  Needless to say, the unregistered ONU transmits a registration response packet on the second upstream channel during the registration period (that is, the quiet zone), and the registered ONU transmits upstream service data on the first upstream channel. Therefore, there is no collision between the registration response packet and the upstream service data. The registered ONU in the non-registration period transmits upstream service data on the first upstream channel, and the second upstream channel is disabled. In this case, the OLT second upstream burst receiver and the ONU second upstream burst transmitter both stop working to dynamically perform PON system energy savings.

  Optionally, in the OLT shown in FIG. 3, the first upstream channel is configured to transmit only the first upstream service data, and the second upstream channel is a registration response packet and a second one. Configured to transmit two upstream service data.

  The first DBA scheduling module 211 is configured to generate a first upstream bandwidth grant that includes a first upstream transmission time slot.

  The second DBA scheduling module 212 is configured to generate a second upstream bandwidth grant that includes a second upstream transmission time slot and a registration time slot.

  The first upstream transmission time slot is used to instruct the registered ONU to transmit the first upstream service data on the first upstream channel, and the second upstream transmission time slot is the second Used to instruct the registered ONU to send the second upstream service data on the upstream channel of the non-registered ONU to send a registration response packet on the second upstream channel. The first upstream service data delay request is higher than the second upstream service data delay request.

  Optionally, the delay of the first upstream service data is less than that of the second upstream service data. Specifically, the ONU transmits upstream service data corresponding to the low latency service on the first upstream channel, registers the newly added ONU, and becomes a high latency service on the second upstream channel. Send the corresponding upstream service data.

  Note that when an unregistered ONU sends a registration response packet based on a registration time slot within the second upstream bandwidth grant, the second upstream service data collides with the registration response packet on the second upstream channel. In order to prevent this, the registered ONU needs to stop sending the second upstream service data on the second upstream channel.

  Needless to say, in this embodiment, the PON system can transmit the upstream service data through two upstream channels, and at this time, the low latency service is not affected by the ONU registration process. Increases data transmission speed.

  In the above-described embodiment, an example in which two DBA scheduling modules are arranged in the OLT is used for explanation. In another possible implementation, only one DBA scheduling module may be deployed in the OLT, which uses the DBA scheduling module to transmit upstream data on the first upstream channel and the second upstream channel. To control. Based on the OLT shown in FIG. 2, the OLT includes a DBA scheduling module 210 and a control module 290, as shown in FIG.

  The control module 290 is connected to the DBA scheduling module 210 and is configured to control the DBA scheduling module 210 to enable or disable the registration function.

  As an option, the control module 290 controls the DBA scheduling module 210 at a predetermined interval to enable the registration function, and disables the registration function when the period for enabling the registration function reaches a predetermined period. The DBA scheduling module 210 is controlled.

  When enabling the registration function, the DBA scheduling module 210 generates a first upstream bandwidth grant that includes a first upstream transmission time slot and a second upstream bandwidth grant that includes a registration time slot. .

  Correspondingly, after each ONU in the PON system has received the first upstream bandwidth grant and the second upstream bandwidth grant, the registered ONU is included in the first upstream bandwidth grant. The first upstream service data is transmitted on the first upstream channel based on the first upstream transmission time slot, the unregistered ONU transmits a registration response packet, and is included in the second upstream bandwidth grant Complete the registration and activation on the second upstream channel based on the registered time slot.

  If the registration function is disabled and the second upstream channel is configured to send only registration response packets, the DBA scheduling module 210 is configured to send upstream service data on the first upstream channel. Generating a first upstream bandwidth grant that includes a first upstream transmission time slot.

  If the registration function is disabled and the second upstream channel is configured to send a registration response packet and the second upstream service data, the DBA scheduling module 210 is configured to transmit the first upstream channel on the first upstream channel. 1st upstream transmission to instruct registered ONUs in the system to transmit 1 upstream service data and to transmit 2nd upstream service data on 2nd upstream channel A first upstream bandwidth grant including a time slot and a second upstream bandwidth grant including a second upstream transmission time slot are generated.

  Upstream data is transmitted in bursts on the first upstream channel and the second upstream channel. Therefore, as an option, the OLT further includes a memory 280, as shown in FIG. 4, the OLT knows the arrival time of the upstream data, and the OLT upstream burst receiver receives the upstream data. Prepare to receive data before it arrives. The memory 280 is connected to the DBA scheduling module 210, and the memory 280 is further connected to the downstream TC module 220 and the upstream TC module 230.

  After obtaining the upstream bandwidth grant generated by the DBA scheduling module 210, the memory 280 makes two copies of the upstream bandwidth grant. One copy is sent to the downstream TC module 220. The downstream TC module 220 generates downstream data including upstream bandwidth grant through downstream framing and convergence, and finally transmits the downstream data to the ONU. The other copy is stored and sent to the upstream TC module 230. The upstream TC module 230 controls the first upstream burst receiver 251 to receive the upstream data burst transmitted by the ONU on the first upstream channel based on the upstream bandwidth grant, The second upstream burst receiver 252 is controlled to receive upstream data burst transmitted by the ONU on the two upstream channels.

  Optionally, after obtaining upstream bandwidth grant and before the upstream data arrives, the upstream TC module 230 may include a first upstream burst receiver 251 and a second upstream burst transmitter 252. To the first upstream burst receiver 251 to start receiving upstream data transmitted by the ONU on the first upstream channel and ONU on the second upstream channel. Instructs the second upstream burst receiver 252 to start receiving the transmitted upstream data.

  Further, the upstream TC module 230 further transmits an ONU that transmits upstream data on the first upstream channel and an ONU that transmits upstream data on the second upstream channel to further transfer the upstream data. Can be identified based on upstream bandwidth grant.

  Further, the upstream TC module 230 further performs authentication on the upstream data transmitted by the ONU based on the upstream bandwidth permission in order to determine whether the ONU performing unauthorized access is in the PON system. it can. For example, when detecting upstream data out of the upstream transmission time slot indicated by permission of upstream bandwidth, the upstream TC module 230 determines that the ONU that performs unauthorized access exists in the PON system. As another example, after receiving the upstream data, the upstream TC module 230 determines the upstream bandwidth based on the upstream transmission time slot in which the transmitting side (ONU transmitting upstream data) transmits the upstream data. The corresponding ONU identifier is searched for permission, and if the found ONU identifier does not match the ONU identifier on the transmitting side, it is determined that the ONU that performs unauthorized access is in the PON system. The ONU identifier is an LLID or ONU ID assigned by OLT. For authenticated upstream data, the OLT directly filters the upstream data, and for authenticated upstream data, the OLT further analyzes the upstream data and includes it in the upstream data. Get service information.

  In this embodiment, because the memory is used to provide upstream bandwidth grant to the upstream TC module, the upstream TC module is based on the upstream bandwidth grant to receive the upstream burst receiver that receives the upstream data. Can be controlled. Thus, the upstream data is received more accurately. In addition, the upstream TC module can further perform authentication on the received upstream data using upstream bandwidth permission to prevent unauthorized access to the ONU from affecting the PON system.

  FIG. 5 is a schematic structural diagram of an ONU according to an embodiment of the present application. In the present embodiment, an example in which ONU is used in the PON system shown in FIG. 1 is used for explanation. The ONU has a downstream TC module 510, at least one DBA response module 520, an upstream TC module 530, a downstream receiver 540, a first upstream burst transmitter 551, and a second upstream burst. And a transmitter 552.

  The downstream receiver 540 is configured to receive downstream data transmitted by the OLT (in a broadcast manner) on the downstream channel. Downstream data is transmitted in the form of optical carrier signals on the downstream channel.

  Downstream data includes an upstream bandwidth grant that is used to control the ONU to transmit upstream data. Optionally, when ONU is used in a GPON system, the BWmap message sent by OLT carries upstream bandwidth grant, or when ONU is used in an EPON system, it is sent by OLT. Gate messages that carry upstream bandwidth grants.

  Optionally, the downstream data further includes downstream service data that the ONU requests to obtain, such as video data and audio data that the ONU requests to obtain.

  After obtaining the downstream data, the downstream receiver 540 provides the downstream data to the downstream TC module 510 connected to the downstream receiver 540.

  In one possible implementation, after obtaining the downstream data, the downstream TC module 510 collects the upstream bandwidth grant and downstream service data contained in the downstream data and sends it to the downstream TC module 510. Provide downstream service data to the connected terminal device and provide the specified upstream bandwidth grant to the DBA response module 520 connected to the downstream TC module 510.

  The DBA response module 520 corresponds to the OLT DBA scheduling module in the embodiment described above and is configured to control the ONU to transmit upstream data on the upstream channel based on the obtained upstream bandwidth grant. Is done.

  As shown in FIG. 5, the DBA response module 520 is further connected to the upstream TC module 530 to transmit upstream data based on the upstream bandwidth grant included in the downstream data. It is configured to control the upstream TC module 530.

  Unlike the prior art in which the ONU transmits upstream data using only one upstream channel, in this embodiment, the ONU transmits upstream data to the OLT using two upstream channels.

  Optionally, the downstream data includes a first upstream bandwidth grant and a second upstream bandwidth grant. The DBA response module 520 controls the upstream TC module 530 to transmit upstream data on the first upstream channel based on the first upstream bandwidth grant and based on the second upstream bandwidth grant. And controls the upstream TC module 530 to transmit the upstream data on the second upstream channel.

  Optionally, the upstream TC module 530 is further configured to receive an upstream bandwidth request sent by the respective DBA response module 520 and upstream on an upstream channel corresponding to the DBA response module 520 Report bandwidth requests. The upstream bandwidth request is obtained by the DBA response module 520 by collecting statistics on data packets in the transmission queue.

  To transmit upstream data on two channels, the upstream TC module 530 is connected to the first upstream burst transmitter 551 and the second upstream burst transmitter 552, and the first upstream burst Transmitter 551 is used to transmit upstream data on the first upstream channel, and second upstream burst transmitter 552 is used to transmit upstream data on the second upstream channel.

  Optionally, the upstream TC module 530 triggers the first upstream burst transmitter 551 to transmit upstream data when it needs to transmit upstream data on the first upstream channel. Therefore, an enabling signal is transmitted to the first upstream burst transmitter 551 corresponding to the first upstream channel. The upstream TC module 530 triggers the second upstream burst transmitter 552 to transmit the upstream data when the upstream data needs to be transmitted on the second upstream channel. An enabling signal is transmitted to the second upstream burst transmitter 552 corresponding to the upstream channel.

  In the present embodiment, the registration function is disabled in the first upstream channel, the registration function is enabled in the second upstream channel, and the registration function in the first upstream channel and the second upstream channel Activation and deactivation are controlled by the OLT.

  The registration response packet can be transmitted only in the upstream channel for which the registration function is enabled, and the different upstream channels do not collide with each other. Therefore, as an option, the ONU selects the first upstream channel for which the registration function is disabled to transmit upstream service data, and transmits the registration response packet to enable the registration function. To select the second upstream channel that has been configured. Alternatively, on the basis of the service delay request, the ONU transmits the upstream service data corresponding to the low delay service (service having a relatively high delay request), so that the first upstream channel in which the registration function is disabled And select the second upstream channel on which the registration function is enabled to send the registration response packet and the upstream service data corresponding to the high-delay service (service with relatively low delay request) To do.

  Needless to say, two upstream channels are configured, the registration function is disabled on the first upstream channel, and the registration function is enabled on the second upstream channel, so in the PON system When an unregistered ONU is sending a registration response packet on the second upstream channel, the registered ONU can still send upstream service data on the first upstream channel, and the ONU registration is service upstream data The situation that affects the transmission of the network is prevented, and the system delay requirement of the low-delay service is satisfied.

  Note that the downstream channel, the first upstream channel, and the second upstream channel share one ODN in the wavelength division multiplexing method, and the wavelengths of the first upstream channel and the second upstream channel are different. , A wavelength multiplexer / demultiplexer 560 is further disposed in the ONU and is configured to combine or split optical carrier signals in the upstream channel and the downstream channel.

  In one possible implementation, the upstream bandwidth grant transmitted by the OLT on the downstream channel is obtained by multiplexing the first upstream bandwidth grant and the second upstream bandwidth grant. Correspondingly, after receiving the upstream bandwidth grant, the ONU demultiplexes the upstream bandwidth grant, and the first upstream bandwidth grant and the second upstream bandwidth grant obtained by demultiplexing. Therefore, it is necessary to transmit the upstream data on the corresponding upstream channel. Based on the ONU shown in FIG. 5, the ONU includes a first DBA response module 521, a second DBA response module 522, and a demultiplexing module 570, as shown in FIG. .

  The demultiplexing module 570 corresponds to the multiplexing module of the OLT in the above-described embodiment, obtains the upstream bandwidth grant received by the downstream TC module 510, and further, the first upstream bandwidth grant and the first The upstream bandwidth grant is configured to be demultiplexed to obtain two upstream bandwidth grants.

  Further, the demultiplexing module 570 is further connected to the first DBA response module 521 and the second DBA response module 522, and grants the first upstream bandwidth grant obtained by demultiplexing to the first The second upstream bandwidth grant provided to the DBA response module 521 and obtained by demultiplexing is configured to be provided to the second DBA response module 522.

  Optionally, the demultiplexing module 570 can receive the first upstream bandwidth grant by demultiplexing based on the upstream channel identifier contained in the (multiplexed) upstream bandwidth grant. And a second upstream bandwidth grant. The first upstream bandwidth grant corresponds to the upstream channel identifier of the first upstream channel, and the second upstream bandwidth grant corresponds to the upstream channel identifier of the second upstream channel. Yes. In addition, the demultiplexing module 670 transmits the first upstream bandwidth grant and the second upstream bandwidth grant to the corresponding DBA response module.

  As shown in FIG. 6, the first DBA response module 521 is connected to the demultiplexing module 570, and upstream data on the first upstream channel based on the first upstream bandwidth grant. Is configured to control the upstream TC module 530.

  The second DBA response module 522 is connected to the demultiplexing module 570, and the upstream TC module 530 is configured to transmit upstream data on the second upstream channel based on the second upstream bandwidth grant. Configured to control.

  In one possible implementation, the first upstream channel with the registration function disabled is used only for transmitting upstream service data, and the second upstream channel with the registration function enabled is registered. Used only for sending response packets.

  In the case of an ONU that is registered in the PON system, the upstream TC module 530 of the ONU uses a first upstream burst transmitter 551 to transmit upstream service data to the OLT on the first upstream channel. To trigger, a first enabling signal is transmitted to the first upstream burst transmitter 551 based on the upstream transmission time slot within the first upstream bandwidth grant.

  In the case of an unregistered ONU in the PON system, the upstream TC module 530 of the ONU triggers the second upstream burst transmitter 552 to transmit a registration response packet to the OLT on the second upstream channel. Therefore, a second enabling signal is transmitted to the second upstream burst transmitter 552 based on the registered time slot within the second upstream bandwidth grant.

  In other words, the first upstream channel with the registration function disabled is used only to transmit upstream service data, and the second upstream channel with the registration function enabled receives the registration response packet. When used only for transmission, any registered ONU in the PON system transmits upstream service data to the OLT on the first upstream channel, and any unregistered ONU is OLT on the second upstream channel. Send a registration response packet to. In order to prevent the ONU registration process from affecting the process of transmitting upstream service data, the upstream service data and the registration response packet are transmitted on separate upstream channels.

  In another possible implementation, the first upstream channel with the registration function disabled is used to transmit the first upstream service data and the second up with the registration function enabled. The stream channel is used to transmit a registration response packet and second upstream service data.

  In the case of an ONU that is registered in the PON system, the upstream TC module 530 of the ONU has a first upstream burst transmitter 551 to transmit the first upstream service data on the first upstream channel. Is transmitted to the first upstream burst transmitter 551 based on the first upstream transmission time slot within the first upstream bandwidth grant. At the same time, the upstream TC module 530 triggers the second upstream burst transmitter 552 to transmit the second upstream service data on the second upstream channel, and therefore within the second upstream bandwidth grant. A fourth enabling signal is transmitted to the second upstream burst transmitter 552 based on the second upstream transmission time slot. The delay request for the first upstream service data is higher than the delay request for the second upstream service data.

  For an ONU that is unregistered in a PON system, the upstream TC module 530 of that ONU triggers the second upstream burst transmitter 552 to transmit a registration response packet on the second upstream channel. The second enable signal is transmitted to the second upstream burst transmitter 552 based on the registered time slot within the second upstream bandwidth grant. In order to prevent the registration response packet from colliding with the second upstream service data in the second upstream channel, when the unregistered ONU sends the registration response packet in the second upstream channel, it is registered. The ONU needs to stop sending the second upstream service data on the second upstream channel. Briefly, in this embodiment, the first upstream channel is used to transmit the upstream service data of the low latency service, and the second upstream channel is used to perform ONU registration. It is further used to transmit upstream service data of high latency service. Therefore, since two upstream channels are used to transmit upstream service data and ONU registration does not affect the low latency service, the transmission rate of the upstream service data in the PON system is further increased.

  In the above-described embodiment, only an example in which the first DBA response module 521 and the second DBA response module 522 are connected to the same upstream TC module 530 is used in the description. In another possible implementation, the upstream TC module 530 may be divided into two upstream TC submodules. The first DBA response module 521 and the second DBA response module 522 are connected to the upstream TC submodule of the first DBA response module 521 and the second DBA response module 522, respectively, and use the upstream TC submodule. To send upstream data. This is not limited in the embodiment.

  In the above-described embodiment, an example in which the ONU includes two DBA response modules is used for the description. In another possible implementation, based on the ONU shown in FIG. 5, the ONU includes a DBA response module 520 and a channel selection module 580, as shown in FIG.

  The DBA response module 520 is connected to the downstream TC module 510 and is configured to control the upstream TC module 530 to transmit upstream service data based on the received first upstream bandwidth grant. Or configured to control the upstream TC module 530 to transmit a registration response packet based on the received second upstream bandwidth grant.

  One end of the channel selection module 580 is connected to the upstream TC module 530, and the other end of the channel selection module 580 is connected to the first upstream burst transmitter 551 and the second upstream burst transmitter 552. Yes. After obtaining the upstream data (upstream service data or registration response packet) to be transmitted using the upstream TC module 630, the channel selection module 580 selects the upstream burst transmission selected to transmit the upstream data. The device is further determined based on the ONU registration status.

  If the ONU is in the registered state, the channel selection module 580 selects the first upstream burst transmitter 551 to transmit the upstream service data generated by the upstream TC module 530 through framing and convergence. Alternatively, if the ONU is in an unregistered state, the channel selection module 580 selects the second upstream burst transmitter 552 to transmit a registration response packet generated by the upstream TC module 530.

  In this embodiment, in order to dynamically perform ONU energy saving, when the ONU is in a registered state based on the ONU registration state, the channel selection module of the ONU sets the second upstream burst transmitter. Disable (i.e. disable the second upstream channel of the ONU), send upstream service data on the first upstream channel using the enabled first upstream burst transmitter, and ONU Is in an unregistered state, disable the first upstream burst transmitter (ie disable the first upstream channel of the ONU) and turn on the enabled second upstream burst transmitter To send a registration response packet on the second upstream channel.

  To prevent ONU registration from affecting low-latency service, if ONU needs to send upstream service data of low-latency service and high-latency service at the same time, ONU will send low-latency service data from ONU registration process. It is necessary to isolate the upstream process. In one possible implementation, based on the ONU shown in FIG. 6, the ONU further includes a service classification module 590, as shown in FIG.

  The service classification module 590 classifies the upper layer service according to a predetermined classification standard, and classifies the upper layer service into the first class and the second class. The delay request for services belonging to the first class is higher than the delay request for services belonging to the second class.

  Optionally, the service classification module 590 is configured to collect a delay request for each service and determine a service class for the service based on the delay request.

  Furthermore, the service classification module 590 selects the corresponding DBA response module (corresponding upstream channel) based on the service class to which each service belongs in order to transmit the upstream service data corresponding to the service.

  A service that the service belongs to the first class (that is, the service is a low-latency service) because the high-latency service is insensitive to delay, that is, the ONU registration does not affect the high-latency service If the class indicates, the service classification module 590 forwards to the first DBA response module 521 to process the service. The first DBA response module 521 controls the upstream TC module 530 to transmit the first upstream service data corresponding to the service through the first upstream channel in which the registration function is disabled. If the service class indicates that the service belongs to the second class (i.e., the service is a high latency service), the service classification module 590 passes to the second DBA response module 522 to process the service. Forward. The second DBA response module 522 controls the upstream TC module 530 to transmit the second upstream service data corresponding to the service through the second upstream channel in which the registration function is enabled.

  Optionally, for upstream data transmitted on the same upstream channel, ONU can further sort the service based on the priority of the service, and prioritize the upstream data corresponding to the high priority service. Can be sent to. This is not limited in the present embodiment.

  In this embodiment, in order to prevent the low latency service from being affected by ONU registration and satisfy the system delay requirement of the low latency service, ONU classifies the service using the service classification module, and the registration function is disabled. The first upstream channel that is selected to transmit upstream data corresponding to the low latency service, and the second upstream channel that has the registration function enabled is the upstream data corresponding to the high latency service Select to send.

  In the ONU shown in FIGS. 5 to 8, both the first upstream burst transmitter 551 and the second upstream burst transmitter 552 are fixed in the ONU. However, in the actual operational process, the second upstream burst transmitter 552 works only when registration is performed or when the second upstream service data needs to be transmitted. As a result, the utilization of the second upstream burst transmitter 552 is relatively low. To reduce the overall manufacturing cost of the ONU, one possible implementation is based on the ONU shown in FIG. 5, and the ONU includes an optical module slot 910, as shown in FIG. The optical module slot 910 is used for inserting the first optical module 911 and the second optical module 912.

  The first optical module 911 includes at least a downstream receiver 540 and a first upstream burst transmitter 551, and the second optical module 912 includes at least a downstream receiver 540 and a second upstream burst receiver 551. Including. Specifically, when the first optical module 911 is inserted into the optical module slot 910, the first optical module 911 uses the downstream receiver 540 to receive downstream data on the downstream channel, and Upstream burst transmitter 551 is used to transmit upstream data on the first upstream channel. When the second optical module 912 is inserted into the optical module slot 910, the second optical module 912 receives the downstream data on the downstream channel and uses the second upstream burst transmitter 552 to perform the second up. Transmit upstream data on the stream channel. Since the registration function is disabled in the first upstream channel and the registration function is enabled in the second upstream channel, the second optical module 912 is inserted in the optical module slot 910 in the unregistered ONU in the PON system. After receiving downstream data including registered time slots on the downstream channel, the unregistered ONU transmits a second upstream burst transmitter in the second optical module 912 to complete registration and activation. A registration response packet can be sent to OLT using 552. After the ONU completes registration, the second optical module 912 is removed, the first optical module 911 is inserted into the optical module slot 910, and downstream data including the upstream transmission time slot is received on the downstream channel. Then, the registered ONU can transmit upstream service data to the OLT using the first upstream burst transmitter 551 in the first optical module 911.

  Note that after the second optical module 912 is removed and before the first optical module 911 is inserted into the optical module slot 910, the ONU receives downstream data transmitted by the OLT within a specific period. Does not synchronize. As a result, the ONU is no longer in a normal working state. After the second optical module 911 is inserted into the optical module slot 910, the OLT delivers the registration information to the ONU in the downstream channel so that the ONU can recover the normal working state. Restore normal working state based on.

  Needless to say, when installing the ONU, the installer only needs to perform the ONU registration at the ONU registration stage using the second optical module 920. After completing the ONU registration, the installer completes the installation of the ONU. Therefore, the first optical module 910 is inserted into the ONU. To reduce ONU manufacturing costs, installers can complete different ONU installations using the same second optical module 920.

  In another possible implementation, the wavelength multiplexer / demultiplexer 560, the downstream TC module 510, the DBA response module 520, the upstream TC module 530, and the second optical module 912 can further form a registration-only ONU registration device. The SN or MAC address of the ONU registered device is set to be changeable. When a newly added ONU (including the first optical module 910) needs to be registered, the ONU registration device obtains the SN or MAC address of the newly added ONU, and the newly added ONU Access the PON system. When receiving downstream data sent by the OLT on the downstream channel, the ONU registration device completes registration and activation, based on the registration time slot contained in the downstream data. Send a registration response packet (including the newly added ONU SN or MAC address) on the channel. After the ONU registration device completes registration based on the SN or MAC address of the newly added ONU, the ONU registration device is removed, and the newly added ONU accesses the PON system. Since the ONU registration device has already performed registration using the SN or MAC address of the newly added ONU, the registration is completed when the newly added ONU accesses the PON system. A first upstream burst transmitter 551 in module 910 can be used to transmit upstream service data.

  Note that after the ONU registration device is removed and the newly added ONU accesses the PON system, the newly added ONU may be in an initial state. In order for the newly added ONU to work properly, the OLT delivers registration information to the ONU on the downstream channel, and the ONU recovers the normal working state based on the registration information.

  In this embodiment, the downstream receiver and the first upstream burst transmitter are integrated into the first optical module, and the downstream receiver and the second upstream burst transmitter are integrated into the second optical module. All of the newly added ONUs can complete the ONU registration using the same second optical module, improving the use of the second upstream burst transmitter, and the manufacturing cost of the ONU Decrease.

  In the ONU shown in FIG. 9, the second upstream channel is used only for ONU registration, and any upstream service data is transmitted on the first upstream channel. If the amount of upstream service data is relatively large, the transmission pressure on the first upstream channel becomes excessively large, which affects the low-latency service. In order to reduce the transmission pressure on one upstream channel, the ONU is based on the ONU shown in FIG. 5, and the ONU has a first optical module slot 1011 and a second optical module as shown in FIG. Module slot 1012. The first optical module slot 1011 is used to insert the first optical module 1021, and the second optical module slot 1012 is used to insert the second optical module 1022.

  The first optical module 1021 includes at least a first upstream burst transmitter 551, and the second optical module 1022 includes at least a downstream receiver 540 and a second upstream burst transmitter 552.

  In the case of a newly added ONU, the second optical module 1022 is inserted into the second optical module slot 1012, the ONU accesses the PON system, and the ONU receives the downstream receiver 540 in the second optical module 1022. Can be used to receive downstream data, and registration and activation can be completed on the second upstream channel based on a registration time slot included in the downstream data. If the ONU is exclusively configured to transmit high-latency service upstream service data, after completing the registration on the second upstream channel, the ONU further sends upstream service data on the second upstream channel. Send. The newly added ONU performs device registration on the second upstream channel, but since the high-delay service is insensitive to delay, the registered ONU is not severely affected.

  To prevent ONU registration from affecting the low latency service, if the ONU needs to send upstream service data for the low latency service, plug the first optical module 1022 into the first optical module slot 1011 There is a need. After the first optical module 1022 is plugged into the ONU, the ONU uses the second upstream burst transmitter 552 in the second optical module 1022 to send the second upstream service data corresponding to the high delay service. Transmit, and use the first upstream burst transmitter 551 in the first optical module 1021 to transmit the first upstream service data corresponding to the low delay service to offload the upstream service data. At the same time, since the newly added ONU registers with the second upstream channel, ONU registration does not affect the transmission of upstream service data in the first upstream channel.

  If the optical module shown in FIG. 9 and FIG. 10 includes both an upstream burst transmitter and a downstream receiver, the optical module is connected to the wavelength multiplexer / demultiplexer to combine or divide the received optical carrier signal. There is a further need to include a multiplexer. This is not limited in the present embodiment of the present application.

  FIG. 11 is a flowchart of a data exchange process in the PON system according to an embodiment of the present application. The PON system includes an OLT and at least two ONUs, which are connected to each ONU using ODN, and the OLT and at least two ONUs exchange data on one ODN downstream channel and two upstream channels To do.

  Step 1110: The OLT sends downstream data to each ONU on the downstream channel, the downstream data includes upstream bandwidth grant, and the upstream bandwidth grant controls the ONU to send upstream data. Used for.

  Optionally, the upstream bandwidth grant is generated by at least one DBA scheduling module of the OLT.

  Optionally, the downstream data includes a first upstream bandwidth grant and a second upstream bandwidth grant, wherein the first upstream bandwidth grant is upstream data on the first upstream channel. The second upstream bandwidth grant is used to control the ONU to send upstream data on the second upstream channel and is sent by the ONU. Upstream data includes upstream service data or registration response packets.

  Optionally, if the PON system is a GPON system, the upstream bandwidth grant is carried in a BWmap message, or if the PON system is an EPON system, the upstream bandwidth grant is carried in a Gate message.

  Step 1120: The ONU receives downstream data on the downstream channel.

  Correspondingly, each ONU in the PON system receives downstream data transmitted by OLT in a broadcast manner on a downstream channel.

  Step 1130: The ONU transmits upstream data on the first upstream channel or the second upstream channel based on the upstream bandwidth grant included in the downstream data.

  The ONU further obtains the upstream bandwidth permission included in the downstream data, and transmits the upstream data to the OLT on the first upstream channel or the second upstream channel based on the registration state of the ONU. The registration function is disabled in the first upstream channel, the registration function is enabled in the second upstream channel, and the registration function is used to register the unregistered ONU.

  Optionally, if the ONU is unregistered and the resulting upstream bandwidth grant includes a registration time slot, the ONU registers with the second upstream channel with the registration function enabled. A registration response packet is transmitted to the OLT in the time slot.

  Optionally, if the ONU is in a registered state and the resulting upstream bandwidth grant includes an upstream transmit time slot, the ONU is the first upstream channel with the registration function disabled. To send upstream service data to the OLT in the upstream transmission time slot, or ONU sends upstream service data to the OLT in the upstream transmission time slot on both the first upstream channel and the second upstream channel. To do.

  In this embodiment, to prevent ONU registration from affecting upstream service data transmission and satisfy the system delay requirement of low-delay service, ONU transmits upstream service data and is generated by OLT. Perform ONU registration on different upstream channels based on stream bandwidth permission.

  Note that the downstream channel, the first upstream channel, and the second upstream channel share one ODN with wavelength division multiplexing, and avoid interference between the first upstream channel and the second upstream channel. Therefore, the wavelengths of the first upstream channel and the second upstream channel are different.

  Step 1140: The OLT receives the upstream data transmitted by each ONU on the first upstream channel and the second upstream channel.

  Correspondingly, the OLT receives upstream data transmitted by each ONU on the first upstream channel and the second upstream channel. The upstream data includes a registration response packet transmitted on the second upstream channel and upstream service data transmitted on the first upstream channel and / or the second upstream channel.

  Optionally, when receiving the upstream service data transmitted by the registered ONU, the OLT analyzes the upstream service data and further feeds back the downstream data corresponding to the ONU in the downstream channel. When the OLT receives a registration response packet transmitted by an unregistered ONU, the OLT registers the unregistered ONU.

  In one possible implementation, the downstream data transmitted by the OLT on the downstream channel includes a first upstream bandwidth grant and a second upstream bandwidth grant. The ONU sends downstream data to the OLT on the first upstream channel based on the first upstream bandwidth grant after receiving the downstream data, and / or on the second upstream bandwidth grant. Based on this, upstream data is transmitted to the OLT on the second upstream channel. Hereinafter, an embodiment will be described as an example.

FIG. 12 is a flowchart of a data exchange process in a PON system according to another embodiment of the present application.

  Step 1201: The OLT generates a first upstream bandwidth grant and a second upstream bandwidth grant.

  In the present embodiment, in the PON system, the registration function is invalidated in the first upstream channel, and the registration function is validated in the second upstream channel. In other words, an unregistered ONU in the PON system completes registration and activation on the second upstream channel. Correspondingly, the first upstream bandwidth grant generated by the OLT is used to instruct the registered ONU to transmit upstream service data on the first upstream channel, and the first generated by the OLT. A second upstream bandwidth grant is used to instruct the unregistered ONU to send a registration response packet on the second upstream channel during the registration period, or a second upstream bandwidth grant is the non-registration period Used to instruct registered ONUs to transmit upstream service data on the second upstream channel.

  Optionally, the OLT includes a first DBA scheduling module and a second DBA scheduling module that uses the first DBA scheduling module to generate a first upstream bandwidth grant and a second DBA. A second upstream bandwidth grant is generated using a scheduling module.

  In one possible implementation, the OLT is up if the first upstream channel is configured to send only upstream service data and the second upstream channel is configured to send only registration response packets. A first upstream bandwidth grant including a stream transmission time slot is generated, and a second upstream bandwidth grant including a registration time slot is generated. The first upstream bandwidth grant is used to instruct registered ONUs in the PON system to transmit upstream service data on the first upstream channel in the upstream transmission time slot. The second upstream bandwidth grant is used to instruct unregistered ONUs in the PON system to send a registration response packet on the second upstream channel in the registration time slot.

  In another possible implementation, the first upstream channel is configured to transmit the first upstream service data, and the second upstream channel transmits the registration response packet and the second upstream service data. When configured to transmit, the OLT generates a first upstream bandwidth grant that includes a first upstream transmission time slot, and a second that includes a second upstream transmission time slot and a registered time slot. Generate an upstream bandwidth grant for. The first bandwidth grant is used to instruct registered ONUs in the PON system to transmit the first upstream service data on the first upstream channel in the first upstream transmission time slot. The second bandwidth grant registers (based on the second upstream transmission time slot) to transmit the second upstream service data on the second upstream channel during the non-registration period (ie non-quiet zone) Used to command a registered ONU, or a second bandwidth grant (based on a registered time slot) commands an unregistered ONU to send a registration response packet on the second upstream channel during the registration period Used for. The delay request for the first upstream service data is higher than the delay request for the second upstream service data.

  Note that the registration function validation and invalidation in the first upstream channel and the second upstream channel are flexibly set by the OLT. Specifically, the OLT can set the registration function to be enabled on the first upstream channel and can set the registration function to be disabled on the second upstream channel. Alternatively, the OLT can set the registration function disabled on the first upstream channel and can set the registration function enabled on the second upstream channel. In the present embodiment of the present application, only an example in which the registration function is disabled in the first upstream channel and the registration function is enabled in the second upstream channel is used in the description. However, this is not limited.

  As an option, the OLT obtains the channel transmission quality of the first upstream channel and the second upstream channel at predetermined intervals. If the channel transmission quality of the first upstream channel is better than the channel transmission quality of the second upstream channel, the OLT controls the registration function to be disabled on the first upstream channel and the second upstream channel Control the registration function to be enabled in the stream channel. If the channel transmission quality of the second upstream channel is better than the channel transmission quality of the first upstream channel, the OLT controls the registration function to be disabled on the second upstream channel, and the first upstream channel Control the registration function to be enabled in the stream channel.

  Optionally, the upstream data is burst transmitted on the first upstream channel and the second upstream channel. Therefore, to ensure that the OLT knows the arrival time of the upstream data and the OLT upstream burst receiver is ready to receive the data before the upstream data arrives, the OLT generates the first upstream A response upstream burst that stores a stream bandwidth grant and a second upstream bandwidth grant and receives upstream data based on the first upstream bandwidth grant and the second upstream bandwidth grant Control the receiver.

  Step 1202: The OLT obtains a multiplexed upstream bandwidth grant by multiplexing the first upstream bandwidth grant and the second upstream bandwidth grant.

  Optionally, a multiplexing module is placed in the OLT, and the multiplexing module performs multiplexing and convergence on the upstream bandwidth grant generated by the OLT.

  Since the first upstream bandwidth grant and the second upstream bandwidth grant are multiplexed and sent to the ONU on the same downstream channel, the first upstream bandwidth grant and the second upstream bandwidth In the process of multiplexing the width grants, the OLT needs to add an upstream channel identifier corresponding to the first upstream bandwidth grant and the second upstream bandwidth grant, and then the upstream channel identifier is added. Multiplex upstream bandwidth grants. Thus, the ONU can distinguish between the first upstream bandwidth grant and the second upstream bandwidth grant, and can determine the upstream channel corresponding to the different upstream bandwidth grants. As an option, the OLT may directly generate a first upstream bandwidth grant and a second upstream bandwidth grant with an upstream channel identifier. This is not limited in the present embodiment of the present application.

  In one possible implementation, if the OLT is used in a GPON system, the OLT will receive a first BWmap message (ie a message carrying a first upstream bandwidth grant) and a second BWmap message (ie a second up). The upstream channel identifier is added separately to messages carrying stream bandwidth grants).

  In one possible implementation, if the OLT is used in an EPON system, the OLT will receive a first Gate message (ie a message carrying a first upstream bandwidth grant) and a second Gate message (ie a second up message). The upstream channel identifier is added separately to messages carrying stream bandwidth grants).

  Step 1203: The OLT sends downstream data to each ONU on the downstream channel, and the downstream data includes the multiplexed upstream bandwidth grant.

  Optionally, after performing upper layer service adaptation, GEM encapsulation, TC framing, and physical layer adaptation, the OLT generates downstream data and transmits downstream data on the downstream channel. Control the built-in downstream transmitter. Upper layer service adaptation includes user data adaptation and OMCI adaptation.

  Step 1204: The ONU receives downstream data on the downstream channel.

  Correspondingly, each ONU in the PON system receives downstream data transmitted by OLT in a broadcast manner on a downstream channel.

  Step 1205: The ONU demultiplexes the received upstream bandwidth grant to obtain a first upstream bandwidth grant and a second upstream bandwidth grant.

  After receiving the downstream data, the ONU obtains the multiplexed upstream bandwidth grant contained in the downstream data, demultiplexes the upstream bandwidth grant, and the first upstream bandwidth grant. And obtain a second upstream bandwidth grant.

  Optionally, the ONU obtains the multiplexed upstream bandwidth grant and demultiplexes the multiplexed upstream bandwidth grant based on the upstream channel identifier contained in the upstream bandwidth grant. And obtaining a first upstream bandwidth grant used to control the first upstream channel and a second upstream bandwidth grant used to control the second upstream channel.

  Step 1206: The ONU transmits upstream data on the first upstream channel based on the first upstream bandwidth grant and / or the second upstream based on the second upstream bandwidth grant. Transmit upstream data on the channel.

  In one possible implementation, if the first upstream channel is used to send upstream service data and the second upstream channel is used to send only registration response packets, the registered ONU Transmit upstream service data on the first upstream channel based on the upstream transmission time slot included in one upstream bandwidth grant, and the unregistered ONU is included in the second upstream bandwidth grant A registration response packet is transmitted on the second upstream channel based on the registered time slot.

  In one possible implementation, the first upstream channel is used to transmit the first upstream service data, and the second upstream channel transmits the registration response packet and the second upstream service data. Registered ONUs transmit first upstream service data on the first upstream channel based on the first upstream transmission time slot included in the first upstream bandwidth grant. The second upstream service data is transmitted on the second upstream channel based on the second upstream transmission time slot included in the second upstream bandwidth grant, and the unregistered ONU In order to complete the launch, the registered time slot within the second upstream bandwidth grant Based on this, a registration response packet is transmitted to the OLT on the second upstream channel.

  The same ONU needs to execute multiple services, and the delay request varies depending on the service. Optionally, to allow the PON system to meet the delay requirements for low-latency services, registered ONUs can request delays for each upper-layer service before sending upstream data on the two upstream channels. The service class of the service is determined based on the service delay request. If the service class indicates that the service belongs to the first class, the ONU decides to transmit upstream data corresponding to the service on the first upstream channel, and the service belongs to the second class If the service class indicates this, the ONU decides to transmit upstream data corresponding to the service on the second upstream channel.

  For upstream data transmitted on the same upstream channel, ONU can further sort the service based on the priority of the service, and preferentially transmit the upstream data corresponding to the high priority service. Can do. This is not limited in the present embodiment.

  Step 1207: The OLT receives the upstream data transmitted by each ONU on the first upstream channel and the second upstream channel.

  As an option, a first upstream burst receiver and a second upstream burst receiver are arranged in the OLT. The OLT receives upstream service data transmitted by the registered ONU on the first upstream channel using the first upstream burst receiver and receives upstream service data transmitted by the registered ONU, or A registration response packet sent by the unregistered ONU is received on the second upstream channel using the second upstream burst receiver.

  Optionally, if the OLT stores the generated upstream bandwidth grant, it resets the internal upstream burst receiver before the upstream data arrives, and the first upstream channel and the second Instructs the upstream burst receiver to start receiving upstream data transmitted by the ONU on the upstream channel.

  As an option, the OLT may further comprise an ONU that transmits upstream data on the first upstream channel and an ONU that transmits upstream data on the second upstream channel to further transfer the upstream data, Further identification is possible based on upstream bandwidth grants.

  Optionally, the OLT further performs authentication on the upstream data transmitted by the ONU based on upstream bandwidth grants to determine if there is an unauthorized access ONU in the PON system. it can. For example, when detecting upstream data out of the upstream transmission time slot indicated by the upstream bandwidth permission, the OLT determines that there is an ONU that performs unauthorized access in the PON system. As another example, after receiving upstream data, the OLT responds with an upstream bandwidth grant based on the upstream transmission time slot in which the sender (ONU transmitting upstream data) transmits upstream data. When the ONU identifier is searched and the found ONU identifier does not match the ONU identifier on the transmission side, it is determined that the ONU that performs unauthorized access is in the PON system. The ONU identifier is an LLID or ONU ID assigned by OLT. For authenticated upstream data, the OLT directly filters the upstream data, and for authenticated upstream data, the OLT further analyzes the upstream data and includes it in the upstream data. Get service information.

  In this embodiment, the OLT generates a first upstream bandwidth grant and a second upstream bandwidth grant that are used to control the first upstream channel and the second upstream channel, respectively. Multiplexing the first upstream bandwidth grant and the second upstream bandwidth grant provides the upstream bandwidth grant multiplexed to each ONU in the downstream channel. In this way, the ONU can separately control data transmission on the first upstream channel and the second upstream channel based on the received upstream bandwidth grant, and the upstream data is transmitted from the first upstream channel and the first upstream channel. The OLT is reached sequentially through the two upstream channels, and collisions between upstream data are avoided.

  In this embodiment, the OLT controls the upstream burst receiver that receives the upstream data using the generated upstream bandwidth grant so that the upstream data is received more accurately. At the same time, the OLT performs authentication on the received upstream data using upstream bandwidth permission to prevent unauthorized access to the ONU from affecting the PON system.

  The serial numbers of the above-described embodiments of the present application are for illustrative purposes only and are not intended to indicate the priorities of the embodiments.

  A person skilled in the art can understand that all or part of the steps of the embodiments can be performed by hardware or by a program instructing related hardware. The program can be stored on a computer-readable storage medium. Storage media may include read only memory, magnetic disks, optical disks and the like.

  The foregoing descriptions are merely specific embodiments of the present application, and are not intended to limit the present application. Any change or equivalent replacement or improvement made without departing from the spirit and principle of the present application shall fall within the protection scope of the present application.

110 Optical line terminal (OLT)
120 Optical network unit (ONU)
130 Optical distribution network (ODN)
131 optical fiber
132 Power splitter
210 DBA scheduling module
211 First DBA scheduling module
212 Second DBA scheduling module
220 Downstream TC module
230 Upstream TC module
240 downstream transmitter
251 First upstream burst receiver
252 Second upstream burst receiver
260 Wavelength multiplexer / demultiplexer
270 multiplexing module
280 memory
290 control module
510 downstream TC module
520 DBA response module
521 1st DBA response module
522 Second DBA response module
530 upstream TC module
540 downstream receiver
551 1st upstream burst transmitter
552 Second Upstream Burst Transmitter
560 Wavelength multiplexer / demultiplexer
570 demultiplexing module
580 channel selection module
590 Service classification module
630 upstream TC module
670 Demultiplexing module
910 Optical module slot
911 1st optical module
912 Second optical module
1011 First optical module slot
1012 Second optical module slot
1021 First optical module
1022 Second optical module

FIG. 2 is a schematic structural diagram of an OLT according to an embodiment of the present application. In this embodiment, an example in which OLT is used in the PON system shown in FIG. 1 is used for explanation. The OLT includes at least one DBA scheduling module 210, a downstream TC module 220, an upstream TC module 230, a downstream transmitter 240, a first upstream burst receiver 251, and a second upstream burst. And receiver 252 .

Specifically, the start time field and grant size field of the BWmap message are both 16 bits, but the actual value ranges from 0 to 9719 (including 0 and 9719), that is, only 14 bits are used. The multiplexing module 270 can identify the upstream channel corresponding to the BWmap message using one most significant bit or two most significant bits of the start time field and the GrantSize field. For example, if one most significant bit is 0, this means that the BWmap message corresponds to the first upstream channel, and if one most significant bit is 1, this means that the BWmap message This means that it corresponds to the second upstream channel. Alternatively, if the two most significant bits are 00, this means that the BWmap message corresponds to the first upstream channel, and if the two most significant bits are 11, this means that the BWmap message This means that it corresponds to the second upstream channel.

Optionally, after obtaining upstream bandwidth grant and before upstream data arrives, the upstream TC module 230 may include a first upstream burst receiver 251 and a second upstream burst receiver 252. To the first upstream burst receiver 251 to start receiving upstream data transmitted by the ONU on the first upstream channel and ONU on the second upstream channel. Instructs the second upstream burst receiver 252 to start receiving the transmitted upstream data.

Optionally, after obtaining upstream bandwidth grant and before the upstream data arrives, the upstream TC module 230 includes a first upstream burst receiver 251 and a second upstream burst receiver 252. To the first upstream burst receiver 251 to start receiving upstream data transmitted by the ONU on the first upstream channel and ONU on the second upstream channel. Instructs the second upstream burst receiver 252 to start receiving the transmitted upstream data.

Optionally, the demultiplexing module 570 can receive the first upstream bandwidth grant by demultiplexing based on the upstream channel identifier included in the (multiplexed) upstream bandwidth grant. And a second upstream bandwidth grant. The first upstream bandwidth grant corresponds to the upstream channel identifier of the first upstream channel, and the second upstream bandwidth grant corresponds to the upstream channel identifier of the second upstream channel. Yes. In addition, the demultiplexing module 570 sends the first upstream bandwidth grant and the second upstream bandwidth grant to the corresponding DBA response module.

One end of the channel selection module 580 is connected to the upstream TC module 530, and the other end of the channel selection module 580 is connected to the first upstream burst transmitter 551 and the second upstream burst transmitter 552. Yes. After obtaining the upstream data (upstream service data or registration response packet) to be transmitted using the upstream TC module 530 , the channel selection module 580 selects the upstream burst transmission selected to transmit the upstream data. The device is further determined based on the ONU registration status.

Needless to say, when installing the ONU, the installer only needs to perform the ONU registration at the ONU registration stage using the second optical module 912. After completing the ONU registration, the installer completes the installation of the ONU. Therefore, the first optical module 910 is inserted into the ONU. To reduce ONU manufacturing costs, installers can complete different ONU installations using the same second optical module 912 .

To prevent ONU registration from affecting the low latency service, if the ONU needs to send upstream service data for the low latency service, plug the first optical module 1021 into the first optical module slot 1011 There is a need. After the first optical module 1021 is plugged into the ONU, the ONU uses the second upstream burst transmitter 552 in the second optical module 1022 to send the second upstream service data corresponding to the high delay service. Transmit, and use the first upstream burst transmitter 551 in the first optical module 1021 to transmit the first upstream service data corresponding to the low latency service to offload the upstream service data. At the same time, since the newly added ONU registers on the second upstream channel, ONU registration does not affect the transmission of upstream service data on the first upstream channel.

Optionally, the upstream data is burst transmitted on the first upstream channel and the second upstream channel. Therefore, to ensure that the OLT knows the arrival time of the upstream data and the OLT upstream burst receiver is ready to receive the data before the upstream data arrives, the OLT generates the first upstream store the upstream bandwidth allowed and the second upstream bandwidth allowed, based on the first upstream bandwidth allowed and the second upstream bandwidth allowed, corresponding upstream receives the upstream data Control the burst receiver.

Claims (34)

A passive optical network PON system, the system includes an optical line terminal OLT and at least two optical network units ONU, the OLT is connected to each ONU using an optical distribution network ODN, the OLT and the At least two ONUs exchange data on one downstream channel and two upstream channels,
The OLT transmits downstream data to each ONU on the downstream channel, the downstream data includes upstream bandwidth grant, and the upstream bandwidth grant controls the ONU to transmit upstream data. Used to
The ONU receives the downstream data on the downstream channel, and the upstream on the first upstream channel or the second upstream channel based on the upstream bandwidth grant included in the downstream data. Send stream data,
The OLT receives the upstream data transmitted by each ONU on the first upstream channel and the second upstream channel,
A system in which a registration function is disabled in the first upstream channel, the registration function is enabled in the second upstream channel, and the registration function is used to register the unregistered ONU.   The downstream data includes a first upstream bandwidth grant and a second upstream bandwidth grant, wherein the first upstream bandwidth grant transmits upstream data on the first upstream channel. 2. The second upstream bandwidth grant is used to control the ONU to transmit upstream data on the second upstream channel, wherein the second upstream bandwidth grant is used to control the ONU. The described system. The OLT generates the first upstream bandwidth grant and the second upstream bandwidth grant, and multiplexes the first upstream bandwidth grant and the second upstream bandwidth grant. To obtain the multiplexed upstream bandwidth grant,
The ONU obtains the first upstream bandwidth permission and the second upstream bandwidth permission by demultiplexing the received upstream bandwidth permission, and the first upstream bandwidth permission Transmitting upstream data on the first upstream channel based on, and transmitting upstream data on the second upstream channel based on the second upstream bandwidth grant,
The system according to claim 2. The first upstream channel is used to transmit upstream service data, and the second upstream channel is used to transmit a registration response packet;
The OLT generates the first upstream bandwidth grant that includes an upstream transmission time slot, and generates the second upstream bandwidth grant that includes a registration time slot;
If the ONU is in a registered state, the ONU sends the upstream service data to the OLT on the first upstream channel based on the upstream transmission time slot within the first upstream bandwidth grant. Or if the ONU is in an unregistered state, the ONU sends a registration response packet to the OLT on the second upstream channel based on the registration time slot within the second upstream bandwidth grant. The system according to claim 2 or 3, wherein the system transmits. The first upstream channel is used to transmit first upstream service data, and the second upstream channel is used to transmit a registration response packet and second upstream service data. The delay request for the first upstream service data is higher than the delay request for the second upstream service data;
The OLT generates the first upstream bandwidth grant that includes a first upstream transmission time slot, and the second upstream bandwidth grant that includes a second upstream transmission time slot and a registered time slot. Produces
If the ONU is in a registered state, the ONU is configured to send the first OLT to the OLT on the first upstream channel based on the first upstream transmission time slot within the first upstream bandwidth grant. Of the second upstream service to the OLT on the second upstream channel based on the second upstream transmission time slot within the second upstream bandwidth grant. If the ONU is in an unregistered state, the ONU responds to the OLT on the second upstream channel based on the registered time slot within the second upstream bandwidth grant. The system according to claim 2 or 3, wherein the system transmits a packet. The OLT obtains channel transmission quality of the first upstream channel and the second upstream channel, and the channel transmission quality of the first upstream channel is equal to the channel transmission quality of the second upstream channel. If better, the OLT controls to disable the registration function on the first upstream channel, and controls to enable the registration function on the second upstream channel.
The system according to any one of claims 1 to 5. The OLT stores the generated upstream bandwidth grant;
The OLT controls reception of the upstream data based on the upstream bandwidth grant and / or authenticates the upstream data transmitted by each ONU based on the upstream bandwidth grant. And perform analysis
The system according to any one of claims 1 to 5. The ONU determines the service class of each service based on the delay request for the service,
When the service class indicates that the service belongs to a first class, the ONU transmits upstream data corresponding to the service on the first upstream channel, or the service is a second class When the service class indicates that it belongs to a class, the ONU transmits upstream data corresponding to the service on the second upstream channel,
The delay request for services belonging to the first class is higher than the delay request for services belonging to the second class,
The system according to any one of claims 1 to 5. If the system is a Gigabit-capable passive optical network GPON system, the bandwidth map BWmap message carries the upstream bandwidth grant, or if the system is an Ethernet passive optical network EPON system, the Gate message is the up Carry stream bandwidth grant,
The system according to any one of claims 1 to 5. If the BWmap message carries the upstream bandwidth grant, a predetermined bit of a predetermined field in the BWmap message is used to identify an upstream channel corresponding to the BWmap message;
If the Gate message carries the upstream bandwidth grant, a channel identifier field newly added to the Gate message is used to identify the upstream channel corresponding to the Gate message, or the operation of the Gate message A code is used to identify the upstream channel corresponding to the Gate message;
The predetermined field is a start time field or a grant size field, and the predetermined bit is one most significant bit or two most significant bits of the predetermined field;
The system according to claim 9. The downstream channel, the first upstream channel, and the second upstream channel share the ODN in wavelength division multiplexing, and the wavelengths of the first upstream channel and the second upstream channel are Different,
The system according to any one of claims 1 to 5. An optical line terminal OLT, wherein the OLT includes at least one dynamic bandwidth allocation DBA scheduling module, a downstream transmission convergence TC module, an upstream TC module, a downstream transmitter, and a first upstream A burst receiver and a second upstream burst receiver;
The DBA scheduling module is configured to generate an upstream bandwidth grant, the upstream bandwidth grant is used to control each optical network unit ONU to transmit upstream data;
The downstream TC module is connected to the DBA scheduling module and configured to generate downstream data including the upstream bandwidth grant through downstream framing and convergence;
The downstream transmitter is connected to the downstream TC module and configured to transmit the downstream data to each ONU in a downstream channel;
The upstream TC module is connected to the first upstream burst receiver, and the upstream data transmitted by each ONU in the first upstream channel is transmitted to the first upstream burst receiver. Configured to receive using,
The upstream TC module is further connected to the second upstream burst receiver, and the upstream data transmitted by each ONU on the second upstream channel is transmitted to the second upstream burst receiver. Is configured to receive using
An OLT in which the registration function is disabled in the first upstream channel, the registration function is enabled in the second upstream channel, and the registration function is used to register the unregistered ONU.   The downstream data includes a first upstream bandwidth grant and a second upstream bandwidth grant, wherein the first upstream bandwidth grant transmits upstream data on the first upstream channel. Wherein the second upstream bandwidth grant is used to control the ONU to transmit upstream data on the second upstream channel, wherein the second upstream bandwidth grant is used to control the ONU. OLT described. The OLT includes a first DBA scheduling module, a second DBA scheduling module, and a multiplexing module,
The first DBA scheduling module is configured to generate the first upstream bandwidth grant;
The second DBA scheduling module is configured to generate the second upstream bandwidth grant;
The multiplexing module is connected to the first DBA scheduling module and the second DBA scheduling module, and multiplexes the first upstream bandwidth grant and the second upstream bandwidth grant. Configured to
14. The OLT of claim 13, wherein the multiplexing module is further connected to the downstream TC module and configured to provide the multiplexed upstream bandwidth grant to the downstream TC module. The first upstream channel is used to transmit upstream service data, and the second upstream channel is used to transmit a registration response packet;
The first DBA scheduling module is configured to generate the first upstream bandwidth grant including an upstream transmission time slot;
The second DBA scheduling module is configured to generate the second upstream bandwidth grant including a registration time slot;
The upstream transmission time slot is used to instruct the registered ONU to transmit the upstream service data on the first upstream channel, and the registration time slot is on the second upstream channel. 15. The OLT of claim 14, used to instruct the unregistered ONU to send the registration response packet. The first upstream channel is used to transmit first upstream service data, and the second upstream channel is used to transmit a registration response packet and second upstream service data. The delay request for the first upstream service data is higher than the delay request for the second upstream service data;
The first DBA scheduling module is configured to generate the first upstream bandwidth grant including a first upstream transmission time slot;
The second DBA scheduling module is configured to generate the second upstream bandwidth grant including a second upstream transmission time slot and a registration time slot;
The first upstream transmission time slot is used to instruct the registered ONU to transmit the first upstream service data on the first upstream channel, and the second upstream transmission A time slot is used to instruct the registered ONU to transmit the second upstream service data on the second upstream channel, and the registered time slot is used on the second upstream channel. 15.Used to instruct the unregistered ONU to send a registration response packet, wherein the first upstream service data delay request is higher than the second upstream service data delay request. OLT described. The OLT further includes a control module, and the control module is connected to the first DBA scheduling module and the second DBA scheduling module;
The control module is configured to control the first DBA scheduling module to disable the registration function, and to control the second DBA scheduling module to enable the registration function;
The second upstream bandwidth grant generated by the second DBA scheduling module that enables the registration function includes the registration time slot, and the registration time slot is the registration in the second upstream channel. The OLT according to any one of claims 14 to 16, used to instruct the unregistered ONU to send a response packet. The OLT includes one DBA scheduling module and a control module connected to the DBA scheduling module,
The control module is configured to control the DBA scheduling module to enable or disable the registration function;
When disabling the registration function, the DBA scheduling module generates the first upstream bandwidth grant that includes a first upstream transmission time slot or includes the first upstream transmission time slot Configured to generate the first upstream bandwidth grant and the second upstream bandwidth grant including a second upstream transmission time slot;
When enabling the registration function, the DBA scheduling module allows the first upstream bandwidth grant including the first upstream transmission time slot and the second upstream bandwidth grant including the registration time slot. And is further configured to generate
The first upstream transmission time slot is used to instruct the registered ONU to transmit upstream service data on the first upstream channel, and the second upstream transmission time slot is the Used to instruct the registered ONU to transmit upstream service data on a second upstream channel, and the first upstream service data delay request is a delay of the second upstream service data 14. The OLT of claim 13, wherein the OLT is higher than a request and the registration time slot is used to instruct the unregistered ONU to send a registration response packet on the second upstream channel. The OLT further includes a memory,
The memory is connected to each DBA scheduling module and is configured to store the upstream bandwidth grant generated by each DBA scheduling module;
The upstream TC module is connected to the memory and receives the first upstream burst receiver and the second upstream burst reception to receive the upstream data based on the upstream bandwidth grant. And / or performing authentication and analysis on the upstream data transmitted by each ONU based on the upstream bandwidth grant. Item 21. The OLT according to any one of Items 12 to 18. If the OLT is used in a Gigabit-capable passive optical network GPON system, a bandwidth map BWmap message carries the upstream bandwidth grant, or if the OLT is used in an Ethernet passive optical network EPON system A Gate message carries the upstream bandwidth grant,
The OLT according to any one of claims 12 to 19. If the BWmap message carries the upstream bandwidth grant, a predetermined bit of a predetermined field in the BWmap message is used to identify an upstream channel corresponding to the BWmap message;
If the Gate message carries the upstream bandwidth grant, a channel identifier field newly added to the Gate message is used to identify the upstream channel corresponding to the Gate message, or the operation of the Gate message A code is used to identify the upstream channel corresponding to the Gate message;
The predetermined field is a start time field or a GrantSize field, and the predetermined bit is one most significant bit or two most significant bits of the predetermined field;
21. The OLT according to claim 20. The downstream channel, the first upstream channel, and the second upstream channel share one optical distribution network ODN by wavelength division multiplexing, and the first upstream channel and the second upstream channel The channel wavelength is different,
The OLT according to any one of claims 12 to 19. Optical network unit ONU, wherein the ONU is a downstream transmission convergence TC module, at least one dynamic bandwidth allocation DBA response module, an upstream TC module, a downstream receiver, a first upstream burst transmission And a second upstream burst transmitter,
The downstream TC module is connected to the downstream receiver and the DBA response module, and is configured to provide downstream data received by the downstream receiver on the downstream channel to the DBA response module. The downstream data is transmitted by the optical line terminal OLT,
The DBA response module is connected to the upstream TC module, and controls the upstream TC module to transmit upstream data based on an upstream bandwidth grant included in the downstream data. Composed of
The upstream TC module is connected to the first upstream burst transmitter and configured to transmit the upstream data on a first upstream channel using the first upstream burst transmitter. And
The upstream TC module is connected to the second upstream burst transmitter and configured to transmit the upstream data on a second upstream channel using the second upstream burst transmitter. And
An ONU in which the registration function is disabled in the first upstream channel, the registration function is enabled in the second upstream channel, and the registration function is used to register the unregistered ONU.   The downstream data includes a first upstream bandwidth grant and a second upstream bandwidth grant, wherein the first upstream bandwidth grant transmits upstream data on the first upstream channel. 24. The method of claim 23, wherein the second upstream bandwidth grant is used to control the ONU to transmit upstream data on the second upstream channel. The listed ONU. The ONU includes a first DBA response module, a second DBA response module, and a demultiplexing module,
The demultiplexing module is connected to the downstream TC module and is received by the downstream TC module to obtain the first upstream bandwidth grant and the second upstream bandwidth grant. Configured to demultiplex the upstream bandwidth grant,
The first DBA response module is connected to the demultiplexing module and, based on the first upstream bandwidth grant, transmits the upstream data on the first upstream channel. Configured to control the stream TC module,
The second DBA response module is connected to the demultiplexing module, and based on the second upstream bandwidth grant, transmits the upstream data on the second upstream channel. The ONU of claim 24, configured to control a stream TC module. The first upstream channel is used to transmit upstream service data, and the second upstream channel is used to transmit a registration response packet;
If the ONU is in a registered state, the upstream TC module first validates to the first upstream burst transmitter based on an upstream transmission time slot within the first upstream bandwidth grant. Is configured to transmit a signal, and the first enable signal is used to instruct the first upstream burst transmitter to transmit the upstream service data on the first upstream channel. I,
If the ONU is in an unregistered state, the upstream TC module sends a second enable signal to the second upstream burst transmitter based on a registered time slot within the second upstream bandwidth grant. Configured to transmit, wherein the second enable signal is used to instruct the second upstream burst transmitter to transmit the registration response packet on the second upstream channel. Item 26. The ONU according to item 25. The ONU includes an optical module slot, and the optical module slot is used to insert a first optical module or a second optical module;
The first optical module includes at least the downstream receiver and the first upstream burst transmitter;
The second optical module includes at least the downstream receiver and the second upstream burst transmitter;
When the ONU is in the unregistered state, the second optical module is inserted into the optical module slot, or when the ONU is in the registered state, the first optical module is inserted into the optical module slot. 27. The ONU of claim 25 or 26. The first upstream channel is used to transmit first upstream service data, and the second upstream channel is used to transmit a registration response packet and second upstream service data. The delay request for the first upstream service data is higher than the delay request for the second upstream service data;
If the ONU is in a registered state, the upstream TC module transmits a third to the first upstream burst transmitter based on a first upstream transmission time slot within the first upstream bandwidth grant. The first upstream burst transmitter is configured to transmit the first upstream service data on the first upstream channel. And the upstream TC module transmits a fourth to the second upstream burst transmitter based on a second upstream transmission time slot within the second upstream bandwidth grant. The fourth enabling signal is configured to transmit an enabling signal, and the fourth enabling signal is the second upstream signal. Used to transmit the second upstream service data Le for instructing the second upstream burst transmitter,
If the ONU is in an unregistered state, the upstream TC module sends a fifth enable signal to the second upstream burst transmitter based on a registered time slot within the second upstream bandwidth grant. Configured to transmit, wherein the fifth enable signal is used to instruct the second upstream burst transmitter to transmit the registration response packet on the second upstream channel. Item 26. The ONU according to item 25. The ONU further includes a service classification module;
The service classification module is configured to collect a delay request for each service and determine a service class of the service based on the delay request;
The DBA response module is connected to the service classification module, and when the service class indicates that the service belongs to a first class, the first upstream service data corresponding to the service is sent to the Configured to control the upstream TC module to transmit on one upstream channel;
The DBA response module transmits second upstream service data corresponding to the service on the second upstream channel when the service class indicates that the service belongs to the second class. 28. The ONU of claim 27, further configured to control the upstream TC module. The ONU includes a first optical module slot and a second optical module slot, the first optical module slot is used to insert the first optical module, and the second optical module slot is the Used to plug in the second optical module,
The first optical module includes at least the first upstream burst transmitter;
The second optical module includes at least the downstream receiver and the second upstream burst transmitter;
When the second upstream service data is transmitted, the second optical module is inserted into the second optical module slot, and the first upstream service data and the second upstream service data are 30. The ONU according to claim 28 or 29, wherein when transmitting, the second optical module is inserted into the second optical module slot, and the first optical module is inserted into the first optical module slot. . The ONU includes one DBA response module and a channel selection module,
The channel selection module is connected to the first upstream burst transmitter, the second upstream burst transmitter, and the upstream TC module;
The DBA response module controls the upstream TC module to transmit upstream service data based on the first upstream bandwidth grant, or a registration response based on the second upstream bandwidth grant Configured to control the upstream TC module to transmit packets;
The channel selection module selects the first upstream burst transmitter to transmit the upstream service data generated by the upstream TC module when the ONU is in a registered state; or 25. The ONU is in an unregistered state, configured to select the second upstream burst transmitter to transmit the registration response packet generated by the upstream TC module. ONU. If the ONU is used in a Gigabit-capable passive optical network GPON system, the bandwidth map BWmap message carries the upstream bandwidth grant, or if the ONU is used in an Ethernet passive optical network EPON system A Gate message carries the upstream bandwidth grant,
The ONU according to any one of claims 23 to 31. If the BWmap message carries the upstream bandwidth grant, a predetermined bit of a predetermined field in the BWmap message is used to identify an upstream channel corresponding to the BWmap message;
If the Gate message carries the upstream bandwidth grant, a channel identifier field newly added to the Gate message is used to identify the upstream channel corresponding to the Gate message, or the operation of the Gate message A code is used to identify the upstream channel corresponding to the Gate message;
The predetermined field is a start time field or a GrantSize field, and the predetermined bit is one most significant bit or two most significant bits of the predetermined field;
33. ONU according to claim 32. The downstream channel, the first upstream channel, and the second upstream channel share one optical distribution network ODN by wavelength division multiplexing, and the first upstream channel and the second upstream channel The channel wavelength is different,
The ONU according to any one of claims 23 to 31.

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